My, hoe simply adding a middle name or birth/death date can cause a family tree to grow. Assuming the connections made on MyHeritage.com are correct, the Josephu family tree now has 328 people in 120 families. Some luminaries include renowned violinist Florian Zajic, legendary sculptor Ivan Mestrovic, and actor Otto Waldis. There's a small thread of a chance that there's a connection to Gustav Mahler.
We know some of the well know friends of my grandfather include composer Emerich Kalman, Walter Slezak and Jose Ferrer.
Update 1-10-16: Another illustrious addition to the family tree was revealed - the Oscar winning film director Milos Forman.