J.G.
You go girl!!!!!
Your sister is not your responsibility. She is your mothers!
Too bad for your moms plans. There is no reason why a 14 year old should be living on their own. Please understand I know she is your mom, but she needs to grow up and start thinking of her children instead of being so selfish and thinking of herself. She only has the 9 year old, why can't the 14 year old move in too. So what if she moves away from her friends. It sounds to me like it wouild be the best thing for her.
I think that that is aweful that your mom would put that responsibility on you.
You are not a fuddy dud. There need to be more moms like you who are concerned for their children and believe in rules and discipline. I could go on and on. Just stand your ground. And tell your mom to move her sister home with her where she belongs!
Good luck!
J.