Is Gyorgy Fischer part of the family Ivan and Adam Fischer?

Yes, György Fischer is part of the Fischer family that includes Ivan and Adam Fischer.

* György Fischer (1912-1997) was a Hungarian conductor and violinist.

* Ivan Fischer (born 1951) is a Hungarian conductor, son of György Fischer.

* Adam Fischer (born 1964) is a Hungarian conductor, nephew of György Fischer and son of Iván Fischer's brother.

So, György Fischer is the father of Ivan and the uncle of Adam, making them all part of the same family.