I'm sorry you're away from your siter, it must be really difficult for you and you sound like a really lovely, caring girl. I'm afraid I can't offer any advice because you are only 13 and you would need to be 18 but I wish you all the luck in the world regarding your mum, perhaps she will be able to sort out her issues and take your sister back. Talk to someone, your nan, a social worker if you have one, or even a teacher who might be able to advise you, about the possibilites of you seeing your sister frequently. If you are feeling alone and confused by this situation perhaps you could try childline. They'd really like to hear from you if you are unhappy and would beable to offer more helpful advice. X