FRANK-MARRIAGE, in Law, is where tenements are given by one man to another, together with a wife, who is the daughter or cousin of the donor, to hold in frank-marriage. By such a gift, although nothing but the word frank-marriage is expressed, the donees have the tenements to themselves and the heirs; that is, they are tenants in special tail. For the word frank-marriage not only denotes ex vi termini, an inheritance, like the word frank-almoigne, but likewise limits that inheritance, supplying not only words of descent, but also of procreation. Such donees in frank-marriage are liable to no service but fealty; for a rent reserved therein is void until the fourth degree of consanguinity be past between the issues of the donor and donee.