I know that Jogaila's sister was married to Casimir of Pomerania, what if Casimir of Pomerania becomes the King of Poland and is fertile assuming that Louis of Hungary dies childless after his war with Dusan of Serbia, if Jogaila allies with ITTL Casimir IV because of the marriage would Casimir IV try to gain the Grand Duchy of Lithuania if Jogaila dies Childless after he was usurped by his enemies in order to convert Lithuania? would he try to avenge his brother in law?