My sister-in-law is affecting my relation with my husband, what do I do?
One needs to understand your husband's feelings here as well, since the early life experiences have shaped the attachment with his sister, and that's why he would not be able to adjust to differences between you and his sister. You need to try and work on your communication patterns with her as well and yet to build a relationship. Also don't let this affect your marital life, so that things can get better.