""my next question is "is debt inherited". My parents will pass away one day. What happens to all of their debt? It surely doesn't go to their kids, does it? I can't imagine that it could, but it DID cross my mind.""
Debt cannot be passed on to kids simply because of relation. If you try to claim an inheritance though, things can get complicated.
When your parents die, their estate (home, savings, retirement) will be used to cover their debt. Any excess is a loss whatever company it is owed to. If you try to claim your parents property as an inheritance, you may have to pay some or all or their debt to get it though.