My husband and I have been married for three years. This is my second marriage and his third. I have a elementary son and daughter. He has two daughters. His then 15 (now 18) year old daughter lives with us. She and I got along fine until the last 6 months or so. She turned 18 in January and it has been worse since. My husband and I have a son together and I am pregnant again. I am losing my mind at this point. She does nothing to contribute to the family and expects everything. She is completely disrespectful to me and sneaks around the house when her father is not here. She rolls her eyes and says whatever when I correct her for being rude or a smart alick. She won't keep her room or bathroom clean. She doesn't do any chores. She is so irresponsible that I won't leave my children with her to babysit. She is manipulative and always seems to get her way. She takes my things without asking and doesn't return them. She just thinks she is entitled to everything.
My husband gets angry and insults me when I complain about her and it has really caused issues between us. He has informed me that this could be her house if I don't learn how to speak to her. That she is an adult and should be treated as such. I said no she is a child in this house and should follow the rules. (which he doesn't enforce) How do I mend my marriage without giving in? How do I get her to be responsible? I am on the verge of just leaving... ↓