sister and mother in law problems

[2boys2girls]

Not sure where or how to start, I've encountered so many problems from them that I now avoid them at all costs, my relationship has broken down because of this as he has offered no real support,
I came into the relationship with two children which I guess they excepted but not fully,example(2 of many) at Xmas they would ask if coming for dinner then ask if kids were coming? When I sat they I mean sil and mil as they practically live up each others arses :)... When we were all there one time there wasn't enough ice cream to go around so said my child couldn't have one I said its OK I don't want one,mil said I was only saying it so my child could have one etc
When I had my 1st child with my dp both mil/sil lived at hosp etc and was in our lives a lot ,I didn't mind as we kind of got on ,over years things have worsened many when sil decided to want a baby , hooked up with a fwb just to get pregnant and did. Well life changed from then on in ,I and my children were completely pushed aside .. Each year the women of the family went away I never went as children not invited surprise surprise sil one was , any event that kids weren't invited now included her child , we since went on to have another child but the difference in treatment is so in your face, but partner won't/can't see it, sometimes he agrees to what I'm getting at but says nothing he can do, so last year I decided to step away and not see them and not once have they asked after me etc its like I don't exist, my sil gas even told her Ex that I gave spilt from dp, dp didn't confront until months after to which she said she didn't say so it was all forgotten, sil has done so much from not congratulating me in birth, ignoring texts, only visiting when wanted something yet never able to help in return,no birthday card to me and my children, mil gave my child a small pack jelly beans for birthday.. so much stuff I could go on, her child's birthday party I was blanked she was all over dp introducing him as her brother or child's uncle etc ,when I mentioned to dp he said he didn't notice. I just think if I was the sil/mil I would be asking what's up and trying to make amends but they seem to like fact they get dp and our 2 children to themselves once a week, aibu to stop my contact?I would except their sorry in a heartbeat but I can't see it happening ....

Maybe you should try being moved to relationships. They might be more willing to give you advice.

Maybe i should move relationships instead :-\ just at a loss but thanks for advice xx

I have to be honest, and say that I am not exactly sure what you want here.

I have a great relationship with my MIL, but would never expect to be treated in the same way as she treats my SIL -- it is her daughter, after all. I wouldn't expect to be invited on a girlie weekend or night out with them either.

My SIL, well, I think I would faint with shock if she ever sent me a birthday card; she doesn't even send DH one and, although it is early days, I suspect DC will never receive one either.

I think, to some extent, there is bound to be a difference in the way you are treated compared to your SIL. You are just not MIL's daughter; your relationship has a very different dynamic.

I agree with what you are saying and if this was always the case then I would/could except it but we used to have a good relationship as such, meals/nights out. I was invited to the girls weekend away along with the other female members but it was a no children rule so I never went but once sil had baby she could , sil used yo send cards etc then stopped sending it was like once she had become a mother, she and mil changed, there has always been niggles that I let go but they just built up to the point I no longer wanted to be in their company as did feel excluded ,
Tbh I don't know what I want but somehow it feels better reeling it off on here,