I co-signed for my dad on some student loans.
He passed away and they tried to come after me. Claimed he defaulted. Uhhh duh he died..
I turned them to the estate.
The judge after months of legitation ruled in my favor and they filed on the estate.
Thing is they didnt file on the estate in a timely manner so the estate had already paid everything out and split the rest between the kids and my mom.
They tried to drag me back to court again, the new judge dismissed after I sent paperwork of the initial discharge case.
They continue to harass me on my phone. I finally blocked the numbers and locked my credit.
I have a counter-sue case in the works after they dinged my credit after the dismissal. Screwed my new house loan up.
I say all of that to say this...
Its a shit show if he defaults. So kick his ass and make him pay. Work out an extended payment period. Pay on the interest, do something to keep it from defaulting.
And it doesnt matter who is the primary. They will ding whoever they want for the amount the judge agrees to. That may be you 100% or him partially.
They will get their money how ever they can.