as it says on the tin, what changes if Fredrick duke of York and Albany, second son of George III had children by his wife Frederica of Prussia? Perhaps twins, a boy and s girl, born in 1792. One assumes that George IV might not marry with his brother having two children, but if he does marry as otl and has a daughter, would fredericks son be a contender for her hand in marriage or would they look elsewhere? If Charlotte does die as otl, is there still a rush to the Altar for the rest of George III sons with Fred having two kids who likely have kids of their own?