New name, old user (just in case)
My nephew (DH brother's son) has just turned 4 and is having a birthday party. We live in the same city and my DH and his brother are close but his wife doesn't really like us. We don't exactly know why but she didn't speak to us at all for 3 years after our wedding and when we've asked BIL why or if we've upset her/if there is anything we can do he doesn't really like to talk about it. However, my DH and his brother get the kids together when they can and it's never really been an issue. She has her life and we have ours, not everyone can get on all the time.
However. They are having a party for our nephew and they've invited our 4 yr old but not our 6 yr old. Reason being its a party for 4 year olds. I don't really want to just send my 4yr old, my 6yr old would be pretty upset to be excluded. If the 4yr old saw his cousin more often we could explain it to the 6 yr old but when they meet its all 3 of them and, while they obviously understand about friends parties just being for the one invited, cousin's parties have always been both (there's lots of cousins on my side).
WWBU to decline the invite? And i don't want to upset anyone or annoy our SIL again (not for us or her particually but my MIL is lovely and she doesn't need us falling out), so should we make up an excuse? Just not sure how to handle it!