Hello Amy, sorry to hear that your family is having to go through such a tough time. Not sure how you are able to get along, I know the expense of doctors and therapists can add up quickly. One thing you could check into would be to contact social services in the county that you or they live in. My wife had worked in social services for a county in Minnesota for 25 years. I asked her a little about what sounds like your situation and she thought that you or your older sisters could get custody of your younger sisters and possibly get "relative foster care" to help out financially. I am sure every state or county could be different but it may be something to look into. Hoping for the best for you and your family.