[rabscuttle385]

If this is true, how did the creditors end up calling them in the first place?

The son probably lived at the same address as his parents, so when the creditors called for the son, guess who picked up the phone. Debt collectors will do anything to collect debts owed, even if it means guilt tripping relatives into paying the debts, even if they have no legal responsibility to do so.

[Badeye]

If he was still living with his parents....it seems even more likely they co signed for something.