Farrah + Deb

I always wondered why Farrah hates her mom so much (besides her just being horrible to ppl in general) I always assumed something crazy must have happened to her when she was younger by how she talks about it but a couple days ago I saw a post that said Debra has a bother and he SA’d Farrah and her sister Ashley when they were kids and Deb knew about it and continued to bring them around him. Does anyone know if that’s true? I can definitely see why Farrah has so much resentment and hate for Deb if it is