Did Gon Meet Ging?

Yes he does , and the meeting wasn't emotional or epic as you would expect. It was rather funny and heart warming . Gon first met his dad in a room full of professional hunters during the last round of 13th Chairman election( Episode 146).

Is hisoka related to Gon?

Yes, in the Hunter Chairman Election arc, it is clear that basically everyone who is a licensed hunter knows that Ging Freecss is Gon's dad, including Hisoka.

Does Gon meet Ging?

Synopsis. Gon finally meets his father. Ging does not hesitate to greet him, but Gon quickly becomes more and more emotional as he explains everything that happened to Kite. Ging becomes extremely flustered, but once Gon says that he should be the one who's dead, Ging assures him that Kite trusted him.