Определение co-father-in-law в Английский Язык Английский Язык словарь
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
in plural The relationship between people whose children marry each other; the father of the bride vis-à-vis the father of the groom.