Difference between potentiality and reality

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

Dad: "I will show you"

Dad turns to his wife and asks her: "Would you sleep with Robert Redford for 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 1 Million dollars?
Daughter: “Wow! Yes! This is my fantasy!"

So Dad turns to his elder son and asks him: "Would you sleep with Tom Cruise for 1 million dollars"?
Elder Son: "Yeah! Why not? Imagine what I could do with 1 million dollars! I would never hesitate!"

So the father 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 prostitutes and 1 gay. "