I'm a bit scred to enter the AIBU area, but here goes....
One of my nieces has recently had a birthday. I sent a card and present. Neither her nor my SIL (or BIL for that matter) have phoned to say thank-you, and they never do. There are 4 children, which adds up to a lot of presents in a year.
I like picking out a gift that I think they'll like, and I try to put some thought into it (which doesn't happen the other way round, but that's another story).
Is this normal behaviour now? I wouldn't expect a letter or card (although I'd be really touched to receive one), just a quick call or an email.