WI: His two sons who died in infancy had survived long enough to have issue? They were William of Hatfield (b. 1337), and William of Windsor (b.1348). The second William would not have been called that if his elder brother had survived. This means that there would have been descendants of 7 sons of Edward III alive at the time the War of the Roses breaks out. How does this complicate that matter, or perhaps not all of the descendants get involved?