DP and I have been together 5 years, lived together for 3. He is an integral part of my family.
DP has a small and close family with parents and 1 sister who is married with 3 kids. No one lives close by so there's a lot of family group chats on social media/WhatsApp etc. these often include random and remote cousins and the like and sister's husband. Never once have I been added. Messages I send to his parents are read but unanswered. Yet when I see them they seem to like me (he says they love me) but it certainly doesn't feel like it. He agrees message issue is rude and raised it with them before but nothing changed.
Since we've lived together his sister has sent kids to stay in holidays (we live in coastal tourist area). Kids are lovely and I like them very much. Not once has she thanked me for looking after them. She thanks DP but not me. Last year his sister told him that since we'd been together he'd changed for the worse. He did pull her up on this and she apologised saying he'd misconstrued. No apology was made to me. I've not had any contact since (but have had kids again without any thanks)
This morning he told me she was sending kids for a few days. I proceeded to ask why, when sister clearly doesn't seem to like me, I'm expected to care for her kids (I'd never say no to the kids). He is exasperated with me and says he doesn't know what I want him to do. I truth I don't know what I want him to do. He can't make them like me. His family don't have any contact with his exW and I wasn't a factor in their divorce years ago so it's not that I'm the other woman. It just feels like an uphill struggle of me -v- his family and I'm not sure how to resolve or what I can do. He agrees somewhat with my issues and says they don't treat him much better either but wants me to be the bigger person.
How would you manage this?