<prompt> Human: My sibling and family have been living with my mom for a year and a half. My mom is getting older and they do pay for groceries, but otherwise dont pay any bills. My sibling also takes my mom to the doctor occasionally, but mom is in fairly good shape. Mom enjoys having them there, but it seems unfair that they dont pay anything. Thoughts on what fair rentbill split might be?  <response>: Exactly what mom feels they should pay, which sounds like the current arrangement. 