<prompt> Human: So my gf 20 yo has an old beat up car that is breaking down, she went out looking for a better car and she found a 14,000 car.She needs a co-signer and shes asking her sibling and her mother, however asked if i could be the back up co-signer if they couldnt sign. She said she would need me to sign for 6 months and then she would refinance it to get of off the signing. She currently has a job and is getting a raise soon 13-15, and she says she can make the payments, However she has little to no credit history. And she said this could help her build her credit and mine.I dont know how these co-singing things work, im 24 and I only have a student job earning 15hr. with a decent 750 score Ive always heard that co-sining is a bad idea and should avoid it.Does anyone have any advice? If it helps we have been in a relationship for 3 years. Im afraid she will say i dont trust her or wont be supportive and help her get on her feet.  <response>: If shes not even making 13 an hour then she doesnt need to purchase a 14K car. You especially dont need to cosign anything for your girlfriend. Shes in no position to finance a vehicle. 