I don't care that my little sister is crying

So my little sister 11 years old has been crying and screaming like a banshee because she wants to go over to my mom's house my mom who has abandoned us abused us has somehow convinced my little sister that she is a perfect human being and so my little sister has developed a dependence on her so whenever she is over at my dad's house he constantly screams for my mom and acts like she's being actively tortured and forced to watch everyone she knows and love be murdered on loop and frankly I don't care anymore I have repeatedly banged on the wall telling her to please be quiet because I'm trying to sleep because yes she does it at night I do not care that she is crying anymore he has been able to turn it off and on so quick that I'm convinced it is fake she is kept me awake for hours on end whenever I'm trying to go to sleep frankly I do not even feel bad that she is crying and my dad is torn up because of this he doesn't know if he's doing the right thing and I feel so bad for him because all my dad is done was be there for us whenever my mom abandoned us so am I the jerk for not checking on my sister and not caring that she's crying sorry for the lack of punctuation I just really need to get this out