Understanding Family Law in Ontario: Full Custody, Common-Law Property Rights, and Key Legal Differences Between Marriage and Common-Law

When couples separate in Ontario, they often face complex questions about child custody, property rights, and the impact of their relationship status — whether married or common-law.
This guide explains the grounds for full custody, property rights for common-law partners, and the key legal differences between marriage and common-law relationships, while also addressing related questions Ontario families frequently ask — like how much mediation costs, whether a spouse can keep a child away, what paralegals can do in divorce, and the benefits of marriage vs. common-law in Canada.

Grounds for Full Custody of a Child in Ontario

In Ontario, what people call “full custody” is legally known as sole decision-making responsibility. It gives one parent the exclusive right to make major decisions about a child’s education, healthcare, and upbringing. The other parent may still have parenting time or visitation unless restricted by the court.

When Courts Grant Full Custody

Under Ontario’s Family Law Act and the federal Divorce Act, judges must always make custody or decision-making orders based on the best interests of the child — not the wishes of either parent.
“Full custody,” now formally referred to as sole decision-making responsibility, means that one parent has the exclusive right to make important choices about a child’s upbringing, such as schooling, medical care, and religious or cultural matters.

Courts do not grant full custody automatically. It is considered only when evidence shows that joint decision-making or shared parenting would not be safe, stable, or beneficial for the child.
A judge may award sole decision-making in several common situations:

• The other parent cannot provide safe or appropriate care.
  This could be due to ongoing issues such as substance abuse, serious mental-health challenges, domestic violence, neglect, or inconsistent housing. The court will look for reliable evidence — police reports, medical records, or testimony — that demonstrates these risks.

• Persistent conflict or poor communication between parents.
  When parents cannot cooperate or communicate effectively, joint decision-making may expose the child to frequent disputes, stress, or emotional harm. In such cases, granting one parent sole responsibility helps restore stability and routine.

• The applying parent has been the child’s primary caregiver.
  If one parent has historically provided most of the day-to-day care — managing school, health, and activities — the court often considers maintaining that arrangement to preserve continuity and minimize disruption in the child’s life.

• Evidence of abuse or emotional harm.
  Any credible indication of physical, sexual, or emotional abuse, or of coercive control within the household, weighs heavily in custody decisions. Protecting the child’s safety is always the first priority.

• The child’s own views and preferences.
  For older or more mature children, the court may take their expressed wishes into account — usually through a trained clinician’s report or a Voice of the Child assessment. While these preferences are not decisive on their own, they can influence the outcome when consistent with the child’s welfare.

It is important to note that Ontario courts are reluctant to sever a child’s relationship with either parent. Sole decision-making is granted only when there is clear, compelling evidence that shared arrangements would be harmful or impractical. Even in those circumstances, the other parent often retains parenting time or access, unless doing so would endanger the child.

In essence, the court’s goal is to ensure that the child grows up in an environment that is secure, supportive, and free from conflict. Parents seeking full custody must demonstrate that this outcome can best be achieved through one parent having exclusive decision-making authority.

Can My Wife Keep My Child Away From Me?

No parent can legally keep a child from the other without a court order or proven safety concern.
Until a parenting agreement or order is in place, both parents have equal rights to their child. If your spouse is preventing access:

• Try mediation or a parenting agreement first.
• Document all communication and missed access.
• If the situation continues, you can file an application in family court for a parenting order.

In extreme cases (for example, where the child is being hidden or taken without consent), legal action or police intervention may be necessary. However, most situations are resolved through legal mediation or court-approved parenting plans.

How Much Does Mediation Cost in Ontario?

Mediation is one of the most affordable and effective ways to resolve family disputes without going to court.
The cost of mediation in Ontario varies depending on the complexity of the issues and the professional’s experience:

• Private mediators typically charge between $150 and $400 per hour.
• Many family mediation centres offer sliding-scale fees based on income, sometimes as low as $5–$25 per hour through government-subsidized Family Court Mediation Services.
• A complete separation agreement through mediation may cost $1,500–$3,000 on average — far less than litigation, which can easily exceed $20,000–$50,000 per party.
• Mediation offers benefits beyond cost — it is confidential, faster, less adversarial, and allows both parties to retain control over decisions affecting their family.

Property Rights for Common-Law Couples in Ontario. What Is a Common-Law Relationship?

In Ontario, you are considered to be in a common-law relationship when you and your partner live together in a committed, marriage-like partnership for at least three continuous years, or when you share a child and maintain a stable, long-term relationship.

Common-law partners often assume their legal rights mirror those of married spouses — but under Ontario’s Family Law Act, that’s not the case. When a common-law relationship ends, there is no automatic 50/50 division of property. Each person usually keeps what is registered in their own name, including bank accounts, vehicles, and the home, unless the other partner successfully claims a legal or equitable interest.

This means that if only one person’s name appears on the house title, the other partner does not automatically have a right to remain in the home or receive a share of its value. To establish ownership rights, that partner would need to prove a claim such as unjust enrichment (showing they contributed significantly without fair compensation) or a constructive trust (proving their efforts directly added to the value of the property).

Because of these limitations, many couples who live together without marrying choose to sign a cohabitation agreement. This legal document sets out how property, assets, and debts will be divided if they separate — helping both partners avoid costly legal disputes later.

In short, being in a common-law relationship in Ontario gives you many of the same responsibilities as a married couple, especially regarding children and support, but far fewer automatic property rights. Understanding this difference early helps couples make informed choices about home ownership, finances, and long-term planning.

Property Rights After Separation

Common-law partners do not have the same automatic property division rights as married spouses. Assets remain with the person who owns them unless there’s a legal claim for unjust enrichment or constructive trust. The family home belongs to whoever holds legal title — there is no automatic right to stay in or divide it. Common-law partners can, however, claim spousal support or child support if they meet the legal criteria. Create a cohabitation agreement before or during the relationship. Keep records of financial contributions and property improvements. Jointly title major assets like homes or vehicles if both partners contribute. Update wills and beneficiary designations — common-law partners have no automatic inheritance rights in Ontario.

Marriage vs. Common-Law in Ontario: Key Legal Differences (Described)

Married spouses benefit from a stronger framework of automatic rights under Ontario’s Family Law Act:

Property division: Married spouses share equally in the increase in value of property acquired during marriage through equalization of net family property. Common-law partners do not; each keeps what they own unless proven otherwise.

• Home rights: Both married spouses have a legal right to live in the matrimonial home, regardless of ownership. Common-law partners do not.
• Inheritance: Married spouses inherit automatically if one dies without a will; common-law partners do not and must be specifically included.
• Child custody and support: The rules are the same for both — parenting decisions are based on the child’s best interests.

In summary, marriage offers legal certainty and protection, while common-law relationships require proactive planning to achieve similar financial and property security.

Can a Paralegal Do a Divorce in Ontario?

In Ontario, paralegals cannot legally represent clients in divorce proceedings. Only lawyers can file for divorce or appear in court on divorce matters under the Divorce Act (federal law).
However, paralegals can:

Assist with small claims, landlord/tenant, and some provincial offences. Help complete basic family law forms, such as separation agreements or uncontested divorce paperwork — but they cannot act as your legal representative before a judge.

If your situation involves children, property division, or spousal support, you should work with a family lawyer or mediator to ensure all legal obligations are properly addressed.

Benefits of Marriage vs. Common-Law in Canada

Marriage brings several legal, financial, and emotional advantages that common-law relationships may not automatically provide:

• Legal certainty: Married couples have predictable property, pension, and inheritance rights.
• Tax benefits: Spouses can transfer income, claim spousal tax credits, and benefit from survivor pensions.
• Estate rights: Married spouses automatically inherit without a will (under provincial law).
• Emotional and social recognition: Marriage often simplifies dealing with institutions — banks, hospitals, and immigration authorities.
• Simpler separation process: Though divorce can be stressful, it provides a clear legal framework for finalizing obligations. Common-law relationships offer more flexibility and fewer formalities but require careful legal planning to achieve comparable protection.

Final Thoughts

Whether you are married or common-law, separating or considering mediation, it’s vital to understand your legal rights in Ontario. If you are seeking full custody (sole decision-making), courts will focus on the best interests of your child. If you live common-law, take proactive steps to protect your property and financial interests. If you are navigating divorce, work with a family lawyer or accredited mediator to avoid costly mistakes.

At Separation Pathways, we specialize in helping Ontario families find affordable, compassionate solutions through family mediation — empowering couples to resolve conflict without going to court.

Book a consultation today to explore your options.