My question involves divorce in the State of: OH

My sister has residence in OH or TN, and her fiance has residence in either TN or GA. ( I could find details if pertinent.) They plan to reside in TN.

The fiance has over 100K in student loans. My parents have paid for my sister's tuition. The wedding is to take place a semester or two before graduation.

Of course, I am hoping for a lifetime of happiness for the two. However, I am curious about the worst-case scenario.

When she marries him, will she then be jointly responsible for his debt? If they would divorce, would she be responsible for half of it? If they would purchase a house in both of their names and if they would go into default on the loans, would the house be in jeopardy? Could joint bank accounts be taken?

I don't want to concentrate on the worst-case scenario, but I do want my sister to enter into this with her eyes wide open. Thanks for your input!!