<prompt> Human: So Ive been living with my sister for about 6 months while she goes through her divorce. When trying to refinance her house, she did not qualify to be able to pay out her ex. She has asked me to co-sign on the house. I do not know if together we would qualify anyways, but she is very like seriously, VERY responsible with her money. So Im not worried about her not paying the mortgage. I could continue to live with her for minimal rent payments required, and can turn the down stairs that I already live in into a duplex unit if I wanted add a bathroom and kitchen... already plumbed for that action it is also close to my work and hobbies. Is this a terrible idea?? I have no clue. I 27 and her 39Thanks  <response>: The answer to every should I co-sign question is no, not unless youre completely willing to be fully responsible for the loan if they stop payingbecause thats what co-signing means. 