Parents co-signed student credit line
I read that a spouse that co-signed is legally responsible and so bankruptcy would affect him/her.
However, does that apply to ALL co-signers, such as my retired parents?
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I read that a spouse that co-signed is legally responsible and so bankruptcy would affect him/her.
However, does that apply to ALL co-signers, such as my retired parents?

Yes, it applies to ALL co-signers. If the primary borrower defaults on a loan (or files bankruptcy or a proposal) then the co-signer will be held responsible for the debt.