Fa"ther-in-law` (?), n.; pl. Fathers-in-law (&?;). The father of one's husband or wife; -- correlative to son-in-law and daughter- in-law.

&fist; A man who marries a woman having children already, is sometimes, though erroneously, called their father-in-law.

• A person's father-in-law is his or her spouse's father.