sh*%t just got real................need advice/help

narc was cheating on me for at least 2 years with coworker, amped up the abuse to me, finally we had a fight and he threw me out in the night and told me to "go to your parents"i pressed charges, filed restraining order, etc. dropped charges due to outside pressure and guilt that he would lose his job as cop. i was a real mess at that point but for one year i have maintained low contact, no facebook stalking, no harassment or disparaging the other woman. we are stil legally married, no legal seperation or custody. daugthter had been at my parents because i was in school he was working. his pregnant sister moved in while i was gone and is now moving out after one year. it will be one year on june 8 from when the final discard happened. the "informal" custody is that daughter stayed there ( 200 miles away) with him and his sister and her baby. i know ow and her kids go there. bottom line, found out from daughter that the sister of narc ( who i trust with my daughter and has babysat many times) is moving out and other woman with her 3 kids, 2 from her first husband, and 1 from her second husband to whom she is legally married will be moving in next week. not jealous, but daughter wants to stay with me. she is coming for the summer next week. i live with my parents and am full time enrolled in nursing school. i let daughter do kindergarten with her dad in his house ( he was slick and put it in his name...long story) and i do not approve of the new living arrangment because of their drinking and partying lifestyle and not to be classist, but i will, daughter spends way too much time watching tv and playing video games and other such nonsense and i feel she will be more stable here and get full attention from me. we have no formal custody arrangment, just informal. the game has changed i am considering strongly having her live with me and my parents while i finish school, when she visists me she constantly begs to stay and live with me, but i quickly change the subject. i have never put down her father, although i detest him. this is not about me being jealous of the ow, i got over that a long time ago. any advice from mothers who have children with narcs would be appreciated.i let her stay with him at the time because i was scared of my narc because of the "power" i thought he had, he is a cop and he looks good on "paper". any advice would be appreciated. he does not know of my "plans". i am a much stronger person than i was one year ago and no longer scared of him, he never even informed me of the new living arrangments which i think is terrible. my sister predicted this would happen. he is moving other woman in because she has a paycheck, can help pay the bills on that large house of his, and living there is closer to her job,he will be alone with her and her 3 kids this summer and my daughter and i will be here, 30 minutes from the beach( which she loves) a small town atmosphere. also, he does not go to church and we are members here and she goes to sunday school here as well. i was too scared of him to challenge him last summer but now im not feeling this arrangment for my daughters sake.here she will be the focus of attention by me and my parents. any advice or warnings would be helpful.