This money will never be paid back, and reading between the lines (credit card debt leading to bankruptcy, loss of house to foreclosure no doubt through cash out refinancings, multiple rounds of forebearance on the educational loans), the ParentPlus loans have probably not had a material effect on their lifestyle. I’d love to know just how many payments have ever been made.
In other words, they would be in the same financial position they are right now, except the daughters would not have gone to those expensive schools - perhaps not a bad thing, though ($100K+ in debt for utterly nonselective Manhattanville, just wow).