My DB works very hard and as ex SIL has no living family a lot of the childcare for their DS falls to our side, this is fine we are happy to have him and don't charge SIL. There has never been any animosity.
SIL has always bought birthday gifts for our family from DS and herself presumably by way of thanks for our help.
She has just been to our house dropping off Santa presents for DN as we have more room to hide them until Christmas eve and she also slipped us a gift set and asked if we could wrap it with DN and give it to him for him to give to her Christmas morning
when questioned further she explained how he'd been a bit upset on her birthday which was a few weeks ago when his teacher asked if mummy had gotten anything nice.
AIBU to think it's not our responsibility, we're doing more than enough as it is and that the last thing a 5 year old is thinking about is a gift set for his mother? It's left a really bad taste in my mouth and makes ex SIL come across very passive aggressive!