Am I wrong?

My two kids (1&2) and I moved in with my parents after an abusive relationship last summer. Last week, my dad admitted to me that he had been using meth and popping pills. I knew something was weird but I knew he had underlying mental health issues and just blamed it on that. I didn’t have time to really process because he quickly heavily declined and had cops called on him for mental help and went to the hospital. I have suspicion that my mom knew something sooner because he was showing me his phone and he said something to my mom about selling pills, in text to my mom, a month prior to his confession. Also worth mentioning, I feel my mom enables & caters to him and is oblivious and in denial of him being dangerous, as well as the fact that he has a weird attachment to my kids. Even on drugs he would ask to spend time with them alone and drive them. While he was in the hospital, I got a lock & camera for my room and took on a night job so that I could be home whenever they are awake. He came home a few days ago and they’ve (parents) been glued to the hip since. He’s been trying to spend time with them but I heavily supervise it. Since then, I notice she also makes comments about being upset about the door being locked. She’ll say “what if I need to go in there?”, “if the kids start crying, I can’t go in there”, or asks me to keep them up when I leave and she’ll just put them to bed. I feel like she wants to make sure that he gets time with them, which I think would be fine if I could trust that she wouldn’t allow him to take advantage of me not being around - or her letting him and not telling me. But I also feel guilty and don’t know how to feel. Or don’t know if I’m just being mean/going overboard