Ok this might sound a bit brutal but what the hell are you thinking leaving kids of that age alone? How would your friend feel about you leaving her child unsupervised while you went to bed? Anything could happen and you are the responsible adult. As for that abusive SOB why would you have any contact with him? Don’t use the kids as an excuse cos he sounds like the kind of guy you want as far away from them so everyone’s safety. The man attacked you while your child was in the same bed ffs! What is it going to take for you to wake up and see what’s really going on? Trust me, this is coming from someone who lost her kids and had a POS toxic ex. You are heading down a path you really don’t wanna go. You need to get your shit together for yourself and those babies of yours. I know you’re struggling, so was I but that doesn’t change the facts that your kids are going to suffer if you don’t get some help.