Say Philip the Good and Isabella of Portugal had one more surviving child, a son (John) born in 1435. How would his existence affect history? Assume, that he had good relations with older brother (so there is no usual for House of Valois family strife there). House of Valois-Burgundy ruled over collection of territorries within Kingdom of France and HRE with different rules of inheritance (with Salic Law in French part, and female inheritance being allowed in HRE). If Charles the Bold still dies leaving only daughter, what would happen to his lands? There are several scenarios with Charles having son with Margaret of Burgundy, but ITTL situation is different: John is adult man, not small boy. It should be easier to him to keep control over Duchy of Burgundy.