I believe you are referring to the domestic partnership laws enacted by New Jersey, as well as several other states. The purpose of these statutes is to permit couples that are living together as if in a marriage to obtain benefits such as medical coverage.
However, these laws do not actually create a marriage. Further, as New Jersey does not recognize common law marriages, the partner does not obtain any benefits of a marriage. This would include obtaining an ownership interest in property. Meaning, absent an actual marriage, a quit-claim deed or adding her name to the mortgage, the partner would not obtain any interest in the home.
Please let me know if anything requires clarification.
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