After Gon was healed, he and the other Hunters entered the election hall, resulting in Ging being finally found by Gon.

Does Gon ever 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.