Looking for advice

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I would post this anonymously because it’s super personal, but honestly a lot of you already know a lot of this. So, me and my partner do not have a great relationship. We’ve been “engaged” a couple times, called it off a couple times. We don’t get along. Long story short, he’s a lazy, immature, selfish, angry, ass hole. 🤷🏼‍♀️ I decided to get my shit together and finally call it what it is after he woke me up by calling me a c***, ripping off my blanket, grabbing my ankle and yanking me to the end of the bed while he got in my face and told me to stop disrespecting him before he hits me. Needless to say, im leaving his toxic ass. I’m looking into apartments rite now. But my question is, when should I seek a lawyer for the kids custody? Because his parents have money, and they will do this whole process for him because he’s incompetent. I know it’s going to get ugly because that’s just how he and his parents are. I know they’ll afford a good lawyer and say I can’t take care of them and probably mention my anxiety/depression (which I’ve since been okay). They will use anything against me to try to take these kids away from me. Idk what to do. I can’t afford a lawyer, I can barely afford an apartment. I’m on unemployment rite now because I was previously teaching and am scared to bring anything home to the kids. I need help because like I said, I know this is going to get ugly and they will all work against me and try to take my kids from me. That’s why I’ve stayed as long as i have. 😣