# Grounds for Full Custody of a Child in Canada: When Courts Order Sole Decision-Making Responsibility If you're researching "full custody" in Canada, you're likely in a difficult situation. Perhaps you have genuine concerns about your children's safety with the other parent. Or perhaps you're on the receiving end of such a claim and trying to understand what you're facing. This is a sensitive topic. The decision about who makes major choices for a child, and how much time a child spends with each parent, profoundly affects everyone involved, especially the children. Courts take these decisions seriously, and so should the adults navigating them. Under the federal Divorce Act (and in Ontario), what people often call "full custody" is typically described as sole decision-making responsibility. Courts can and do make these orders, but not lightly. This article explains what the legal test actually is, what circumstances might lead to sole decision-making, and what courts expect to see before making such an order. ## What Is Decision-Making Responsibility? First, some terminology. Since March 1, 2021, the federal Divorce Act (for married parents who are divorcing) uses the terms "[decision-making responsibility](/blog/custody-vs-access-decision-making-parenting-time)" and "parenting time" instead of the older terms "custody" and "access." Ontario also updated its Children's Law Reform Act to use similar terms. You might still hear people use the old language, and older court orders will have it, but the legal framework has shifted. [Decision-making responsibility](/glossary#letter-d) refers to the authority to make significant decisions about a child's life. This includes decisions about health care, education, religious upbringing, extracurricular activities, and other major matters that affect the child's wellbeing and development. Parenting time refers to when a child is physically with each parent. A parent can have parenting time without having decision-making responsibility, and vice versa. The two concepts are related but separate. When people talk about "full custody," they're usually referring to a situation where one parent has sole decision-making responsibility and the majority of parenting time. But courts can and do make different combinations. One parent might have sole decision-making responsibility while the other still has significant parenting time, for example. ## The Starting Point: Best Interests of the Child Every decision about parenting arrangements in Canada is based on the [best interests of the child](/glossary#letter-b). This isn't just a phrase courts use. It's the legal standard that governs all parenting decisions under both the federal Divorce Act and provincial legislation like Ontario's Children's Law Reform Act. The Divorce Act sets out a non-exhaustive list of factors courts must consider when determining the best interests of the child. These include the child's physical, emotional, and psychological safety and wellbeing, the child's needs and the ability of each parent to meet them, the nature of the child's relationships with each parent and other important people, each parent's willingness to support the child's relationship with the other parent, the child's views and preferences (depending on age and maturity), the child's cultural, linguistic, religious, and spiritual upbringing, and any history of family violence. There's no formula that automatically produces a particular result. Courts weigh all the relevant factors based on the specific circumstances of each family. ## What Are the Grounds for Full Custody in Canada? There's no statutory checklist of "grounds for full custody" in Canadian law. Instead, every parenting decision flows from the best interests of the child standard described above. This means courts don't ask "did the other parent do something bad enough to lose custody?" They ask "what parenting arrangement will best serve this child's wellbeing, safety, and development?" Certain circumstances make courts more likely to conclude that sole decision-making responsibility (rather than joint) is in a child's best interests. These aren't technical "grounds" so much as situations where joint decision-making becomes unworkable or unsafe. **An important caution.** If you're reading this hoping to find ammunition against your co-parent, that approach is unlikely to serve you or your children well. Courts are experienced at identifying parents who are focused on winning versus parents who are focused on their children. Exaggerating concerns, making unfounded allegations, or trying to exclude a fit parent from a child's life can backfire significantly and harm your credibility. With that said, here are the circumstances where courts genuinely do order sole decision-making responsibility. ## Circumstances That May Lead to Sole Decision-Making Courts are more likely to order sole decision-making responsibility when one or more of the following situations exist. **The parents cannot communicate or cooperate on major decisions.** Joint decision-making requires parents to consult and agree on significant matters. If the parents' relationship is so damaged that they cannot have productive discussions about their children, or if one parent consistently refuses to engage, joint decision-making may not be workable. Courts won't order an arrangement that sets everyone up for constant conflict. However, difficulty communicating doesn't automatically mean sole decision-making. Courts often expect parents to try communication tools like parenting apps, parallel parenting arrangements, or working through professionals before concluding that joint decision-making is impossible. **There is a history of family violence.** Family violence is a major factor in parenting decisions. The Divorce Act specifically requires courts to consider any family violence and its impact on the ability and willingness of a person to care for the child, the appropriateness of requiring cooperation between the parties, and the child's physical, emotional, and psychological safety and wellbeing. If one parent has been violent toward the other parent or the children, or if there's a pattern of coercive and controlling behaviour, courts may determine that joint decision-making is not appropriate. The abusive parent may still have some parenting time, sometimes supervised or subject to conditions, depending on the evidence and risk factors. The other parent may be given sole authority to make major decisions. For more on how family violence affects parenting cases, see our article on [safely starting a separation from an abusive relationship](/blog/how-to-safely-start-separation-abusive-relationship-canada). **One parent has mental health or addiction challenges that currently impair their parenting.** This is an area that requires particular care. A mental health diagnosis or history of substance use does not automatically disqualify someone from parenting or decision-making responsibility. Courts focus on functional impact and current evidence, for example, whether the issue is affecting judgment, reliability, or a child's safety. Stigmatizing mental health is harmful and courts are alert to attempts to weaponize a diagnosis against a co-parent. However, there are situations where a parent's current functioning genuinely affects their ability to make sound decisions for a child. A parent in active addiction who is making dangerous choices, or a parent experiencing an acute mental health crisis that impairs their judgment, may not be in a position to share major decision-making at that time. Courts look at actual impact on parenting, not labels or diagnoses. They also recognize that circumstances change. A parent who isn't able to share decision-making today may be fully capable of doing so after treatment, recovery, or stabilization. Parenting orders can be varied as circumstances evolve. **One parent is absent, uninvolved, or uninterested.** Sometimes one parent has largely checked out of the child's life. They may have moved away, stopped maintaining contact, or simply shown no interest in being involved in major decisions. In these situations, courts may grant sole decision-making responsibility to the involved parent because there's no one else meaningfully participating. **Interference with the child's relationship with the other parent.** Courts take seriously situations where one parent actively and unjustifiably works to damage the child's relationship with the other parent. This is a complex and contested area of family law. Allegations about interference or "alienation" are fact-specific. Courts look closely at why a child is reluctant, what each parent has done, and whether there are safety concerns. Labels matter less than credible evidence about the child's experience and each parent's conduct. **The parents have fundamentally incompatible views on major issues.** If parents have deeply opposing views on matters like medical treatment, education, or religious upbringing, and there's no realistic prospect of compromise, a court may need to give one parent final say to avoid paralysis on important decisions. ## What Courts Look For: Evidence and Credibility If you're asking a court for sole decision-making responsibility, you'll need to provide evidence supporting your request. Courts don't make these orders based on one parent's say-so. They look at the evidence and assess credibility. The kinds of evidence that can be relevant include documentation of incidents (police reports, medical records, text messages, emails), reports from professionals who have worked with the family (therapists, doctors, school officials), evidence of how each parent has behaved during the separation, and sometimes reports prepared for the court, such as a section 30 assessment under Ontario's Children's Law Reform Act, or a Voice of the Child Report (often prepared through Ontario's Office of the Children's Lawyer) summarizing a child's views and preferences. Courts also pay attention to how each parent presents in the proceedings. A parent who is reasonable, child-focused, and willing to facilitate the child's relationship with the other parent tends to have more credibility than one who is rigid, vindictive, or focused on punishing their ex. ## The Court's Reluctance to Exclude a Parent Courts often try to preserve a child's meaningful relationship with each parent when it's safe and consistent with the child's best interests. Under the Divorce Act, when allocating parenting time, courts must give effect to the principle that a child should have as much time with each spouse as is consistent with the child's best interests. This doesn't mean equal time is presumed, but it does mean courts are cautious about orders that effectively cut one parent out without good reason. This doesn't mean courts ignore genuine concerns. They don't. But it does mean that if you're seeking sole decision-making responsibility, you should expect to clearly explain why joint decision-making won't work and why your proposed arrangement is in the child's best interests. Simply not getting along with your ex, disagreeing about parenting styles, or finding the other parent annoying or difficult is not usually enough. Courts expect adults to put their differences aside for their children's benefit. The threshold for sole decision-making is generally higher than "we don't see eye to eye." ## Can You Get Sole Decision-Making Without Going to Court? Yes, if both parents agree. Parents can negotiate their own parenting arrangements through direct discussion, mediation, collaborative family law, or with the help of their lawyers. If you and your co-parent agree that one of you should have sole decision-making responsibility, you can include that in a [separation agreement](/blog/separation-agreement-ontario-what-to-include). If a dispute later goes to court, a judge can make a parenting order that differs from a separation agreement if the child's best interests require it, and parenting terms may be changed if the legal test for variation is met. If you're negotiating parenting arrangements, especially ones involving sole decision-making, getting legal advice is important. A [family lawyer](/blog/how-to-choose-a-divorce-lawyer-in-ontario) can help you understand whether your proposed arrangement is likely to hold up if challenged and whether it adequately protects your children. ## What About Parenting Time? Sole decision-making responsibility doesn't automatically mean the other parent has no parenting time. These are separate issues, even though they're often discussed together. A parent might have sole decision-making responsibility while the other parent has substantial parenting time (sometimes even close to equal time). The child might spend significant time with both parents, but one parent has the final say on major decisions. In other cases, especially where there are safety concerns, the parent without decision-making responsibility may have limited or supervised parenting time. Courts craft arrangements based on what's best for the particular child in the particular circumstances. The allocation of parenting time, like decision-making responsibility, is governed by the best interests of the child standard. Courts consider many of the same factors. ## Can Sole Decision-Making Arrangements Change? Yes. Parenting arrangements are not necessarily permanent. Either parent can ask the court to vary (change) an order if there has been a material change in circumstances since the order was made. What counts as a material change depends on the situation, but it generally needs to be something significant that affects the child's best interests. For example, if a parent who previously had addiction issues has been in recovery for several years and has demonstrated stability, they might seek to have decision-making responsibility changed to joint. Or if a parent who previously cooperated stops communicating or develops concerning behaviours, the other parent might seek sole decision-making. Courts look at what's best for the child at the time of the application, taking into account how circumstances have changed. ## Getting Legal Advice Parenting disputes, especially ones involving requests for sole decision-making responsibility, are among the most emotionally charged and legally complex areas of family law. The stakes are high, and the process can be overwhelming. If you're considering seeking sole decision-making responsibility, or if the other parent is seeking it and you want to respond, getting legal advice is strongly recommended. A family lawyer can help you understand the strength of your case, what evidence you'll need, and what to expect from the process. If cost is a concern, explore options like [unbundled legal services](/blog/unbundled-limited-scope-family-lawyers-ontario), [Legal Aid Ontario](/blog/free-low-cost-family-law-help-ontario), or at minimum a consultation to understand your situation. Some cases genuinely require full legal representation, especially if they're going to trial. For situations involving family violence, there are additional resources and supports available. Legal Aid Ontario has specific services for survivors of domestic violence, and many communities have organizations that can help with safety planning and navigating the legal system. ## Key Takeaways **Decision-making responsibility is about major decisions.** It refers to who has the authority to make significant decisions about a child's health, education, religion, and other important matters. **Courts use the best interests of the child standard.** Every parenting decision is based on what arrangement best serves the child's wellbeing, safety, and development. **Sole decision-making is not the default.** Courts generally prefer arrangements where both parents remain involved, unless there are good reasons why that won't work. **Approach matters.** Courts are experienced at distinguishing parents focused on their children's wellbeing from those focused on winning or punishing their ex. Exaggerating concerns or making unfounded allegations can damage your credibility. **Communication breakdown can support sole decision-making.** If parents genuinely cannot cooperate on major decisions despite reasonable efforts, courts may give one parent final authority. **Family violence is a significant factor.** A history of violence or coercive control can lead to sole decision-making for the non-abusive parent. **Mental health and addiction are nuanced factors.** These conditions don't disqualify someone from parenting. Courts look at actual current impact on parenting, not diagnoses, and recognize that circumstances can change. **You need evidence, not just allegations.** Courts require evidence to support claims. Documentation, professional reports, and credibility all matter. **Sole decision-making doesn't necessarily mean no parenting time.** Decision-making responsibility and parenting time are separate issues that courts address based on the child's best interests. **Arrangements can change.** If circumstances change significantly, either parent can ask the court to vary the order. **Legal advice is important.** These cases are complex and high-stakes. Getting professional guidance helps you understand your options and protect your children's interests. ### Disclaimer This article provides general information about decision-making responsibility in Canadian family law. It is not legal advice. Parenting cases are highly fact-specific, and the outcome depends on the particular circumstances of your family. If you have questions about your situation or are considering seeking or responding to a request for sole decision-making responsibility, speak with a family law lawyer.