Little sister disrespectful to mom

Question

My little sister "Annie" is 12 and ever since she was little she has had no respect for my mom. I know its because my step dad has always been overruling my mom. Like if she would say no to something, he would jump in and say it was ok. He has always been the "boss" of the house and its sometimes sickening. But whenever Annie wants something from her, she acts nice. But otherwise she is completely vicious. Its like an all out war everyday. None of my other sisters are like this at all. The damage has already been done but how do we fix it now? Thanks if you can help.

Answer 1

make a bet with your little sister.

for example: tell her if she is nice and doesnt scream at your mom or a whole week, then you will take her shopping or do something that she wants to do.  but take it slow

Answer 2

Knock the mess out of her and tell her to act right or else.

Answer 3

This is your mother's problem. She needs to handle this situation, Your Fathar and Mother need to support one another.   They should put there foot down and make decisions together.

Answer 4

You can do nothing. It is your mother's problem. You can however support your mother.

She is manipulative and your mother falls for it.