The French daughter or son (3)
I believe the answer is:
lad
'son' is the definition.
(lad can mean a boy or son)
'the french daughter' is the wordplay.
'the french' becomes 'la' ('the' in French).
'daughter' becomes 'd' (genealogical abbreviation).
'la'+'d'='LAD'
'or' is the link.
(Other definitions for lad that I've seen before include "Youngster" , "Shaver" , "Stable employee" , "Boy, familiar" , "Son" .)