How do I deal with my boyfriend's sister?

Anonymous
She's very jugemental and opinionated. She won't say rude things to your face, but once you're gone, she will say bad things about you behind your back. It's not like I can avoid her, I mean she is my boyfriend's sister, but I wish she would stop saying bad things about me and others. I don't want to start arguments with her by confronting her because that would not solve anything (she is the type of person where it's her way or no way). How can I try to solve this issue or even avoid the problem (But not avoid her, obviously I can't).
How do I deal with my boyfriend's sister?
9 Opinion