I don't want to turn this into an essay do will just go with the basics. No drip feeding or back story.
I have 3 DC but only my youngest is biologically my DH'S. However he treats them all the same.
My ILS (parents in law and sister in law) have never given my older dc (12 and 5) a birthday card or present. Youngest DC is nearly 1 and they have started asking what to buy for his birthday so I know they will buy for him.
DH is fully supportive of this so that's not a problem but AIBU to stop buying for sister in laws 3 children? After all they are biologically nothing to do with me which is obviously the stance she has taken with my oldest DC. If DH decided he wanted to put himself out and buy for them (he won't) then fair enough and I wouldn't ever stand in his way.
That's fair isn't it? Presents for everyone or presents for no one?
I actually wouldn't even mind if they just gave my older dc a card each. It's genuinely no about the money it just the thought and knowing they are accepted.
For context we see or speak to sister in law every single day. It's a close relationship.