Difference between potentially and reality

Youngest Son: Daddy, what is the difference between "potentially" and" in reality"?

Dad: "I will demonstrate"

Dad turns to Wife and asks her: Would you sleep with Robert Redfordfor 1 million dollars?

Wife: Yes of course! I would never waste such an opportunity!

Then Dad asks his daughter if she would sleep with Brad Pitt for 1million dollars?

Daughter: Waow! Yes! This is my fantasy!

Dad next turns to his elder son and asks him: Would you sleep with TomCruise for 1 million dollars?

Elder Son: Yeah! Why not? Imagine what I could do with 1 milliondollars! I would never hesitate!

So Dad then turns back to his younger son saying:

You see son, "potentially" we are sitting on 3 million dollars, but"in reality" we are living with 2 Bitches and a Gay.