Now I know you shouldn't buy to receive but we've never received a birthday or Christmas card or present from our adult son ever, our daughters all do but my son doesn't.
Every Christmas he comes around and opens presents from aunts, cousins, grandparents and us and his sisters while giving no presents in return.
Also every family birthday goes by with out any acknowledgment whatsoever but he'll happily sit and open presents on his birthday.
His sister brought him a very special birthday present this year and as expected got nothing for her birthday just 2 weeks later.
AIBU to just let his next birthday slide and see how he feels? I don't buy to receive but do feel he is taking the piss out of grandparents and wider family which irritates me.
Also want to add he's a very high earner so it has nothing to do with money.