*Long post but im desperate* WWYD?

I have two kids (1&2) and moved in with my parents after DV with their dad. My dad is an alcoholic and is an angry person but he was never violent. Key word being WAS. A month ago, he randomly accused my mom of physically abusing my oldest (which she NEVER did, I was there) and my youngest sister (13) and started to pulling big knives out. I called cops and petitioned to put him in the hospital. That didn’t do shit because she stayed with him in there and they went back to being toxic together after, but I minded my own business because it was nothing physical. But then today, he randomly stayed home from work. Then got up, at 3 in the afternoon, and then got a bag of random shit together and then tells my mom that he’s “done fucking around” and that “if he goes to jail for murder, that she knows why”. I asked her and she started talking to me a little. She told me that he swears we all were “acting” that day to try to put him into rehab and that he’s going to “make whoever was involved pay” and when she asked what he was talking about, he said she’ll just “find out”. Then she told me she was scared of being alone around him and begged me to stay with her to protect her. My mom thinks he is cheating and wanting to get out of the relationship because he left for hours (he does everyday) and came back telling her she needs to move out. So it gives me Chris Watts vibes, honestly.

I don’t know what to do because I’m supposed to work tomorrow and usually my mom babysits. Or my sister (13) and brother (22, special needs) will be here. But obviously, I’m scared for something to happen. My siblings said they know to be around them 24/7 and to call cops immediately.

I’m thinking my options are:

#1. Don’t go, #2. Go but work shorter day, #3. Go but leave immediately if contacted