No that is sister..
Fuck it, your sister could do with a good pounding too. S'only fair if she has to listen to her mom getting hate fucked every night, that she gets a turn on the dick that ruined your mom.
Or are you gonna listen to some asshole screwing all self respect and love for her family out of your mom, but then try n stop him when you see him walk out of your mom's room n into your sister's room? You gonna listen, cockley in hand when your mom is moaning his namr, but then put it away n run to sis' rescue when you start to hear him bullying your sister into sucking her mom's cunt juices off his dick?