<prompt> Human: so somoene asked me to co-sign for a car. and i couldnt say no because they kept asking and begging but now what i want to know is if i just give them a fake social security number, will the loan application just get denied or will that cause problems for me? is this even legal? please help! im not sure what to do he is family and i dont want to ruin our relationship but he keeps asking me to do it and i couldnt say no.edit: Thanks for the advice guys, im just not going to co-sign. going to suck but its better than all alternatives.Assistant: Can you give more info, who is the person, what is their relationship to you. what kind of car. Im curious.Human: he is my fiances moms brother. he is in his 50s with pretty bad credit i think he has like a 500 credit score its a toyota  <response>: No. Deadbeat 50s year old black sheep future in-law moms brother. No no no.If you and you fiance split up, you want nothing to do with these people. If you do go ahead and get married you likely want as little as possible to do with deadbeat uncle. Uncle is an accomplished lifelong mooch and he smells fresh chum in the water by hitting you up for co-sign when likely all the rest of the family already knows better that the get involved financially with the guy.Stay away.Exercise your backbone. Say NO. 