We have no contact with MIL or her DP and one SIL and her DH, basically they're not very nice people - I could go into detail but I'll just make myself pissed off so won't. They haven't seen DS since October either so we took the decision that as well as myself and DH cutting contact we would also bar contact with him. I haven't even told them I'm pregnant.
Today MILs DP texted me to say they're having a surprise party for the other SILs birthday, the SIL that we do still have some contact with, and we're invited.
On the one hand I don't want to spite SIL in her birthday or make her feel she's at fault. On the other hand MIL, etc hate me and have told all of their friends what a completely evil bitch I am so I don't want to go sit in a room with the inlaws and those friends. I also don't want to take DS to the party because why should she think she can act like Grandmother of the Year at a public party when DS is virtually a stranger to her in private?
I know FIL will have something to say about it because he thinks DH and I should just accept that MIL won't ever change (which somehow makes it acceptable for her to treat me and her son like shit) but my instinct is a polite "thanks, but we already have plans/can't get a babysitter/DH is working late" and just take SIL out for a drink or meal on another night.
WWYD?