I'm not sure for cars, but your son probably needs to call his bank first and find out if his loan is assumable. If it is, then it should be possible to officially transfer the debt from your son's name to his aunt.
IMHO, that is probably the best route to go, just to avoid unnecessary issues among family members, should anything come up.
If the loan is not assumable, then it's up to your son and any co-signors to decide if they want to trust the aunt to make payments using the son's credit. But keep in mind, this loan will remain in the son's name and will affect debt-to-income ratios for future credit purchases, and any late payments would be reflected on the son's (and co-signor's) credit, not the aunt's.
I hope this helps!
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