My Mom is Dating an Alcoholic and Wants to Set Me Up with Him

Later that night I was still drinking but tapped out way before them. My mom told me he’d be sleeping on the couch then I come out and they’re both in her room. He’s been staying with us ever since and now my mom is still drinking with him and partying. Even worse she’s lying to me which hurts most of all. I wouldn’t be so upset if I didn’t have to worry about my little sister too, she’s uncomfortable also and misses “the old mom”, the new mom is drinking, hanging out with all different types of men, and always locking her door (my little sister is very clingy). It’s gotten to the point to where I’m looking forward to move out when I’m 18 and I’m considering taking my little sister with me. I need advice and maybe someone to tell me my feelings are valid. Thank you for reading this.