The Favortism
i don't know if anyone caught this in the movie or in the story at all but seems like Amanda was his favorite, I know this isn't the ideal situation to talk about favoritism but it was kind of obvious who he preferred. He constantly beat Michele everytime she got pregnant so she could have a miscarriage but let Amanda keep her baby. He kept her locked in a different room from them which was, weird to me. He left the doors unlocked for Amanda which is how they escaped but not the other girls.
That daughter was their life saver honestly