Noun[edit]. beau-fils m (plural beaux-fils). A stepson, a son of the present spouse of its remarried parent; A son-in-law, the husband of one's daughter or son
Noun[edit]. belle-m�re f (plural belles-m�res). mother-in-law - stepmother. Synonym: mar�tre (dated). See also[edit]. beau-fils m; beau-fr�re m; beau-p�re m