So I’m having some issues with my fiancé’s sister... she keeps talking about me, lying on me, and just always has snide comments for me and attitude. I love my fiancé and I definitely wouldn’t wanna make him choose and cause a rift in the family by being rude to her. But I can’t take it anymore... she’s a mean person, uses any and everyone for their money, very irresponsible and makes the absolute worst decisions. No money management etc... it goes on. Well she’s 29...I am 21 and my fiancé 30. I don’t understand how she can’t just be mature. I’ve been taking care of myself since I was 15 and I’ve always been extremely mature. In this case I just don’t know how to handle it. Plz help

UPDATE!

And it continues.... she’s texting my fiancé about me and an opinion that I didn’t even share with her. Indirectly insulting me and just being rude... and she wants me to go to her going away party... yeah, I’ll be going alright! To celebrate!!!! But man I’m finding it extremely difficult to hold my tongue and be the bigger person... stressed