wow that is a tough one especially with a family member involved i just dont get why they are getting your son to pay off this other guys debt all because he helped once ?Now it seems like they'd be going after the guy who owes the debt instead i wasnt sure what advice to give so i voted hard to say .are you sure your understanding the whole story ?

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A single rose can be my garden... a single friend, my world.
~ Leo Buscaglia