so ladies I need some advice or just some input on what I should do or not do ~ I don’t even know where to start, okay…

so ladies I need some advice or just some input on what I should do or not do ~ I don’t even know where to start, okay so I am almost 28 weeks and since i’ve told my mom I was pregnant she has been super supportive and has been doing everything she can for me. 3 years ago I moved out of her house bc my stepdad was abusive & she didn’t believe me so when I turned 18, I left. she has been w my stepdad since 2010 & literally used to worship him. now for the last few months she has made hints that she’s leaving him or that she wanted me to come back and live w her when my son is born. a few weeks ago she finally confirmed it and we talked about it. I do want to live w her but I am worried about mine and my sons safety honestly. she said soon she is making him leave, he is honestly crazy so I don’t know how he will react to that news. I wanted to wait at least 6 months of him being moved out before I decide to move back in. today i’ve been at her house and we kinda put the room together, started to set up the crib too but don’t have all the pieces so we have to wait on that. she is super excited and I have told her I want to make sure it’s safe. she keeps telling me that it will be but of course i’m still worried. what do you mommies think I should do? move in by the time he’s born or wait a while to see how they figure out the situation? I keep going back and forth about it w myself.