De facto relationships are defined in both the Property Relationships Act 1984 and also the Section 21 C(2) of the Interpretation Act 1987. A de facto may be a person of the same or opposite sex who immediately before the intestates death was in a relationship with the intestate that was either registered under the Relationships Registered Act 2010 or was in a de facto relationship. The alleged de facto must have a relationship of a continuous period of two years or resulted in the birth of a child. Section 105 Succession Act (NSW).