So my parents (mom and step dad) have had a very toxic relationship for a long time. Since they got married roughly 11 years ago they have had a ton of issues. They fight constantly and have gotten into countless physical altercations. They always put my older brother and myself in the middle of it. It is a very long and complicated story of everything that is wrong with them. But short story is my mom is mentally I'll possibly bipolar and very manipulative. Constantly victimizes herself to a sickening extent, and she refuses to realize she has an issue or get help. My dad (stepdad) and I have a better relationship then her and I do. They're marriage has been close to divorce this past couple of years many times. But this September my dad finally decided to leave her and get his own place. It has been extremely messy. My main concern is my little sister. My dad isnt perfect but he is a very good caring and loving father, but since he left my sister had not seen or talked to him once. It has now been over 4 months. She stopped sleeping in her own room and sleeps in bed with my mom every night. She is 12. Any time me or my brother try to talk to her about it she says she doesnt want to. And despite my father reaching out to her constantly she just ignores him. Now she spends 24 7 with my mom. Goes to work with her etc. My mom basically won't let my sister out of her sight. And my sister is doing picking up many unhealthy behaviors from my mom. And my mom is lying to her about my dad and saying things that arent true to make him seem like a monster. My mom is also decently abusive and neglectful. It's so sad that sometimes I wish they would just lock my mom up and take her away. Shes such a horrible person and she hurts everyone around her and takes no responsibility for it.