Definition of co-father-in-law:
°the father of one's son- or daughter-in-law; that is, the father-in-law of one's son or daughter, or, the father of one spouse in relation to the parents of the other spouse.
Definition of co-father-in-law:
°the father of one's son- or daughter-in-law; that is, the father-in-law of one's son or daughter, or, the father of one spouse in relation to the parents of the other spouse.