This is pretty much exactly a subplot of Jane Austen's Persuasion, where William Elliot, cousin and heir presumptive to Sir Walter Elliot, marries the younger woman who's been cozying up to Sir Walter, to make sure she doesn't have children with Sir Walter . . . . Except in this case the Sir Walter marries the younger woman, and Isabella is powerless to cut him out.

I am totally on Isabella's side. She's had this expectation her whole life, and now it gets upended?