One's spouse's father. / (dated) A stepfather.

plural of father-in-law

Alternative spelling of father-in-law

plural of father in law

(nonstandard) plural of father-in-law

plural of co-father-in-law

The father of one's son- or daughter-in-law; that is, the father-in-law of one's child, or, the father of one spouse in relation to the father of the other spouse; either of two or more men whose children marry each other, such as the father of a bride vis-à-vis the father of the groom.

The father of one's boyfriend or girlfriend. / The father of any of one's friends. / The father of one's ex-spouse.

plural of father-out-law