Potentially vs 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!
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 not even 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 two slags and a bender!"