Quick background first:
DH, me and our kids live next to an elderly couple for the past 8 years. My younger brother came to visit us 6 years ago and we held a BBQ & invited elderly couple next door. Their daughter was home for the weekend and we invited her too. She hit it off with my brother that evening and they've been together ever since. They got married 3 years ago and have twins, age 4.
SIL fell out with her parents around the time the twins were born and refuses to visit us, saying she's "not wanting to drive past her parents house" and "not wanting to have to be in the area". My brother seems to support her in this, which is very disappointing because he then won't visit us either.
It is my DH's birthday (a big roundy one) before Christmas and I'm throwing a party for him. I'm inviting my brother and SIL and I know they'll decline. I'm also asking next door, her parents.
Basically I'm being forced to choose between having my next door neighbours and my brother at my party, all because of SIL. She hasn't outright said it, but that's pretty much what's going on. I can't have my own brother to my own house coz of a feud she's having with her parents.
AIBU?