Also means
stepson
Usage Note
Beau-fils has two meanings that context usually clarifies: son-in-law (the husband of one's daughter) and stepson (the son of one's spouse from a previous relationship). The feminine equivalent is belle-fille, which similarly means either daughter-in-law or stepdaughter. The plural is beaux-fils.
Examples
"Mon beau-fils est arrivé pour le dîner de Noël."
Natural Translation
My son-in-law arrived for Christmas dinner.
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