Hi, It's an appositive. Clive
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AnonymousHer son, who is a strikingly handsome man in his 20s, ...
Her son, a strikingly handsome man in his 20s,By the way, this transformation is called "Whiz Deletion". It deletes a wh word (who, which) and a form of be (is, are, ...). wh + is is referred to as whiz.
CJ