@youwillgeteaten oh and a real comment i guess: YMCA/YWCA memberships can be applied for on a sliding scale, gymnastics classes usually cost extra but at least your sis could splash around in the swimming pool on weekends. If you become your sister's legal guardian you're probably elligble for some type of food assistance, but if she's just staying with you for a while you might be stuck with Kickstarter. Domestic violence hotlines can give you recommendations for resources. I recommend getting a new phone number and and not telling your parents. Good luck.
I've been reading the billfold for a while but this is the first post on it i related to.