What is the current state of the law on discrimination against a married couple who live together without being married?

No longer are matters so simple. Increasingly, in all parts of Canada, couples are choosing to live together without being married. The stigma that once attached to these relationships has faded. The law has recognized that married couples and unmarried couples are entitled to equal treatment, for example with respect to insurance regime benefits, and that treating married couples differently from unmarried couples may be discriminatory and violate the equality guarantee of s. 15 of the Canadian Charter of Rights and Freedoms: Miron v. Trudel, 1995 CanLII 97 (SCC), [1995] 2 S.C.R. 418 (S.C.C.).