How do people get on with the other half’s family

Fay • Baby no3 & my last

Basically been with him 10 years the sis in law (his brothers wife) is very hard to get on with she basicallya spoilt brat and the family give in to her ect lots av gone on right I’ve tried so hard to get on with her he nice ect and she just blanks me 🤷‍♀️ his sister says I’m up her arse if I get on with her but thing is when she said that o pulled away and now she’s up her arse they both leave me out of things and it’s reali getting to me now to point I’ve just sat here and cried I sick of getting it chucked back on my face but I do it for my other half and kids so they have a complete family as my family is all separated up 😒😒😒