So my boyfriend has a 12 year old sister, who literally acts like she is 5. Their mum is a single mum, and his sister shares a bed with her. They recently moved house and completely redecorated her room exactly how she asked for it, in hoping she would go and sleep in there, but she refuses. She is selfish and walks all over her mum and her mum allows it. Her mum still does her shoes up and her shirt buttons up for her, she still goes and gets snacks and makes drinks for her, and never gets a please or thankyou. The other day her mum asked her to take out her plate to the kitchen and she literally turned round and said flat out "no" and went upstairs. She wont go out with her friends because she always wants to be with her mum, and she tells her mum when she can/cant go out. How anyone can let their 12 year old rule them like that i dont understand. Opinions on her behaviour/her mum's behaviour?