This guide explains what qualifies as a c ommon law … Understand the legal definition of Common Law in Ontario. Learn the difference between the 3-year family law rule and the 1-year CRA tax rule. Expert guide by Tailor Law. Learn what common law relationships are in Ontario, how they differ from marriage, and why cohabitation agreements matter. Expert insights on legal rights and obligations. May 24, 2018 · Requirements of being common law in Ontario. Property rights and child support obligations. A complete guide from Ontario family law experts. Jul 14, 2025 · Learn your legal rights and responsibilities under common law in Ontario. Understand property, support, and relationship laws clearly. Nov 14, 2025 · Learn what common-law spouses are entitled to in Ontario. Experienced guidance on support, property rights, and legal protections. Legal Definition of Common-LawinOntario. Legally speaking, living common-law means that you’re sharing a home with a person who is not your legal spouse, but with whom you have a conjugal relationship.