My mother has let my little sister sleep in the bed with her since she was born Now she has a man over so my sister isn't able to sleep with her my sister comes to me crying her eyes out saying my mother won't let her go to bed. I understand my mother is an adult and she is allowed to do what she wants but I feel like it's wrong for her to up and do this to my sister since she's only used to sleeping with my mother.

She's 8 years old