When a marriage ends, most people assume the legal headaches boil down to who gets the house, who pays support, and when the children visit. Sure, those are big ones. But separation has a way of unraveling in unexpected directions. And even when both partners agree on the key points, fresh disagreements can pop up later.
This happens everywhere, but because family law rules vary depending on where you live, we’ll use Ontario as our example throughout this piece.
Divorce cases make up 47% of active family court cases in Canada, according to the Department of Justice Canada. It’s a safe bet that some of these couples will end up facing the kinds of issues we’ll be talking about in this article.
1. Parenting Arrangements After Separation
A lot of separated parents start with an informal arrangement about when the children stay with each parent and who handles the day-to-day decisions.
In Ontario, this language has changed. What used to be described as “custody” and “access” is now generally framed in terms of parenting time and decision-making responsibility.
An informal arrangement can work for a while, but problems may come in when circumstances change. One parent changes their work schedule. Someone moves to a different city. Maybe one parent stops following the agreed routine. Suddenly, that informal handshake doesn’t feel so solid.
Here’s the thing. Putting your parenting arrangement into a formal agreement or court order isn’t about distrust. It’s about clarity. It gives both parents something to reference during disagreements. It also makes the arrangement enforceable if things go sideways.
If you’re in this situation and not sure where to start, searching for a custody lawyer in Ontario should be the first step. They can explain what your options are and whether a formal agreement or court order makes sense for your situation.
2. Relocation After Separation
Relocation isn’t a personal decision once children are part of the picture. This is because such a move can upend school routines, transportation, weekday parenting time, and how often a child sees the other parent. Stephen Durbin & Associates also notes that such a move is likely to impact the child’s relationships with others.
This is why relocations in Ontario that involve a child are subject to specific rules under the Children’s Law Reform Act. For example, if relocation will affect the child’s relationship with the other parent, the parent planning the move has to give written notice before the move happens. Skipping that step, or assuming a move is “no big deal,” can land you back in court.
The 2025 Ontario case, Saylor v. Wellington, is a good example. A mother wanted to move with her two children from Corunna to London after securing a job and a home there.
The father argued that the move amounted to a legal relocation because it would affect his parenting time. The court ultimately found that it was a change of residence because the move wasn’t likely to significantly affect the children’s relationship with their father.
3. Disagreements Over Parenting Decisions
Parenting disputes aren’t always about where a child lives or sleeps. Parents can also clash over education, medical treatment, extracurricular activities, travel, and other major aspects of a child’s upbringing.
There’s a crucial distinction here. Parenting time, which refers to the time a child spends in a parent’s care, doesn’t automatically give that parent decision-making responsibility. In Ontario, this responsibility can be allocated between parents in different ways. One parent might have day-to-day care, but major decisions about school or health could be shared or assigned to one person.
A 2026 Ontario Court of Justice case, Kale v. Santiago, reviewed in Law Times News, shows how this can play out. The court gave the mother sole decision-making responsibility after considering the parents’ involvement in the children’s lives, including their school and medical needs. The father lived in the U.S., while the mother handled much of that day-to-day involvement.
4. Children Choosing One Parent
As children get older, they begin to have their own views about their family situation. One example is when a child decides they prefer to live only with one parent. But this is an area full of misconceptions, because contrary to what a lot of people assume, there’s no magic age when a child gets to simply choose which parent they live with.
In fact, under the Divorce Act, a child’s views and preferences are one factor among several, weighed against their age and maturity.
This is sometimes described as “voice, not choice.” In other words, while children should have a meaningful opportunity to express what they want, they don’t necessarily have a say in the final decision. The court will look at the bigger picture and decide based on what’s best for the child.
How to Resolve Family Law Disputes After Separation
Not every post-separation dispute has to go to court. In fact, it shouldn’t be the first consideration. Below are some of the other options open to you when dealing with legal issues after separation.
| Approach | How It Works | Best Suited For |
| Negotiation | Direct talks between you and your ex, but lawyers can assist behind the scenes. | Couples who still communicate and are willing to compromise. |
| Mediation | A neutral mediator comes in to help you find common ground. | Where both sides are acting in good faith and want to avoid court. |
| Collaborative Law | You and your ex work with specially trained lawyers to reach an agreement that you both accept. | People who want a respectful process and need to preserve a co-parenting relationship. |
| Arbitration | A private arbitrator, usually a retired judge, looks at the evidence and makes a decision that’s usually binding on both parties. | When you need a final decision without going to court. |
| Court Proceedings | The dispute is taken to court, and a judge makes decisions on the issues. | High-conflict cases or when the other side won’t negotiate at all. |
The approach you choose will depend a lot on how much conflict there is and whether you and your ex are actually willing to negotiate. That said, picking the right approach early saves money, lowers stress, and keeps control of your family’s future in your hands.
FAQs
Do I need a lawyer for an informal parenting arrangement?
Not necessarily at first, but getting one reviewed by a lawyer before it’s put in writing can prevent disputes later.
Can my ex just move to a different country with our child?
Not without giving proper notice under Ontario’s relocation rules, and not if it significantly affects your parenting time.
When is a child old enough to decide which parent to live with?
There is no fixed age. While a child’s views carry more weight as they grow older and more mature, a judge will ultimately decide based on the child’s best interests.
Wrapping Up
Separation brings unexpected legal hurdles, long after the initial breakup. We’ve covered some of the key ones in this guide, including informal parenting schedules, sudden moves, and changing child preferences, which can quickly cause issues.
Sadly, resolving one agreement doesn’t automatically fix every future issue. This is why you should take the time to understand your legal rights early, so that you can keep minor disputes from turning into long legal battles.