sounds straight forward enough but sister is 21, nephew is 13months. She has only ever lived with our mum who has had a large input in bringing him up. Mum and sister's relationship has broken down, I have had similar issues with our irresponsible mum so don't know whether to send her back to sort it out or let her stay here so she can get her own place. Not sure if sister is mentally prepared for managing a household on her own, though she is financially able. Don't want to guide her in the wrong direction