My parents took out a parent loan when I started college and I'm wondering if there's any possible way that it would come to me if they defaulted, or affect my credit in any possible way.

No, the Parent PLUS loan is 100% in the name of the parent, if they default, it only affects their credit. If they are having trouble making payments, this might be a helpful resource for them: http://www.parentplusloan.com/repayment ... idance.php