What if the alliance between King Henry VIII and King Francis I became lasting, and truly did result in the marriage of Princess Mary to Dauphin Francis?
Say, Henry get's an Edward6-esque boy who lives, but not for long really. Dauphin Francis lives a bit longer to become Queen, and dies weeks after his coronation and actual marriage to Princess Mary. They pull an Arthur-Catherine-Henry, and she marries Prince Henri. The Edward6-esque son dies after reigning four years after Henry VIII's death, and Mary becomes Queen of England. Her son would inherit the thrones of England and France.
Say, Henry get's an Edward6-esque boy who lives, but not for long really. Dauphin Francis lives a bit longer to become Queen, and dies weeks after his coronation and actual marriage to Princess Mary. They pull an Arthur-Catherine-Henry, and she marries Prince Henri. The Edward6-esque son dies after reigning four years after Henry VIII's death, and Mary becomes Queen of England. Her son would inherit the thrones of England and France.