To expect a thank you letter for godchildrens presents

[brizzagirl]

Between us DH and I have 4 godchildren and they each get a present for every birthday and Christmas. For 2 of the godchildren we always get a polite thank you letter, but for the other 2 we hear absolutely nothing and sometimes I even wonder if they received the gift! Or occasionally I might get a message on facebook if I'm lucky ;-)
Perhaps it is just me but having gone to the trouble and expense of buying and sending a present I think it is good manners to send a short thank you. Or AIBU? What do you think?

YANBU, but it's the parents' fault, not the children's no matter how old they are. If parents don't make children do this they don't.

YANBU, it is basic manners.

When I was little I got sent presents by Aunties, Uncles, godparetns etc from all over the world. My mum made me write individual thanks yous by letter every time as there was no email then.

With the advent of email, it is much easier to write and therefore less acceptable not to.

Why not write a generic thank you for my xmas/ birthday gift email and then send the same email to everyone who sent a gift. That would take all of 15 mins.