I'm getting child support from my ex's baby mama

Soooo it's been one hell of a week. For those who don't know I have my ex boyfriend's kids (two boys 4 and 14 and a girl who is 10) because he's stupid and did something dumb and is now facing 5-8 years in prison. Their mother didn't want them and if I didn't take them they would have gotten split of in foster care and my heart won't let that happen. How we broke up was he was being disrespectful and ungrateful just because I wouldn't give him money for commissary in jail. I have 3 kids now to care for. I don't even have my room anymore. I moved into the living room and his oldest son has my room and the 10 and 4 year old share my second room. My mom has been telling me to go after their bio mom for child support because she has so much money and can vacation to Hawaii but can't take care of her children. The reason this was hard is because their mom is fucking bat shit crazy and I try not to piss her off. This women has like 9 restraining orders against her by several different people. When her and my ex broke up and they went to court(mind you. I live in a state that typically favors the mother and they had a 3 week old baby) that judge gave him primary custody VERY quickly. Of all if them, even the baby. Because she's just insane and my ex's oldest son told me how his mom pulled a knife on him once. I just can't. Plus these aren't her only kids. She has 2 adult children she loss rights to early in their childhood on child neglect and abuse charges.

But.. My mom said if I need help I shouldn't be struggling while she's able to vacation... So I did and court ruled in my favor. She has to pay me $1200 a month. I know that seems like a lot but it's based on income. This bitch acted a damn crazy full in church and almost got thrown in jail so now I just feel like I have to watch my back. Also, my ex is being stupid. They offered him a plea deal and he would be out in 2 years but he's not taking it. Like dude. You did it. They have proof you did it. If he doesn't take it then he may not be out in time to see his daughter graduate. Speaking of his 10 year old to help with her confidence I went and took her to get her nails painted. His oldest is kind a loner type so I just played on the Wii with him. Now the baby. This little dude has been a clingy one. He stopped asking when his dad is coming back and now just wants to be by my side every minute. He wears pull ups at night because I think the stress of his dad being gone causes him to have accidents. But be tends to come to the living room and sleep on the pull out with me. I don't mind. He's adjusting the way he knows how. One thing im a little concerned about is him calling me mama. He did that once a couple days ago. I have no idea for sure when my ex is getting out. He could change his mind about the plea and take it and be out in 2 years. If so then i think it could be really harmful for him to get attached to me in that since me and his father aren't together and when he gets out he may not allow me to see then again. Idk just something I've been thinking. Besides all that things have been good with the help of my mom. I just hope their crazy mother stays away