my mother is in the hospital, and at home my sister(20) lives with us. I have an older sister(26) who lives with her husband(27). Should i get to choose who i want to live with?
Your mother gets to decide where you will stay so long as she is competent.
Disclaimer: I am not offering legal advice, assume I do not know the law in your state and that I am just making suggestions for starting points for when you do speak with an attorney. Do NOT rely on anything I write and contact a lawyer in your area immediately after reading my posting.