So I kept my own name when I married. Double barrelled dc to Baby Myname-Hisname.
Some of dhs family send things addressed to Mrs Hisinitial Hissurnane. Sometimes they refer to dc as baby hissurname.
I'm not entirely sure whether all dh family know what all our names are and may just assume I changed my name. It certainly hasn't come up in conversation when I've been there.
They are very traditional but are generally nice and respectful people and I can't imagine them doing it deliberately to make a point.
I've asked dh if they know what mine and dcs names are and he says they do but I'm not convinced he's told them.
It only occasionally it ever comes up for example usually when sending us generous birthday gifts, namely from some of dhs elderly relatives so it feels a little obnoxious to reply with "thanks but I'm actually not Mrs Hisname.
Although on some level I don't like being addressed by a name that's not my own.same with the dc.