For the youngest it's just:
Le cadet de la famille
or
Le benjamin de la famille
There do appear to be some interesting rules regarding usage though:
https://forum.wordreference.com/threads/ain%C3%A9-cadet-pu%C3%AEn%C3%A9-benjamin.1727755/
For the youngest it's just:
Le cadet de la famille
or
Le benjamin de la famille
There do appear to be some interesting rules regarding usage though:
https://forum.wordreference.com/threads/ain%C3%A9-cadet-pu%C3%AEn%C3%A9-benjamin.1727755/
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