Potential and Realistic

A little boy goes up to his dad and he says “Dad?, What’s the difference between ‘potentially’ and ‘realistically’?”
To which the father replies “Well son, go ask your mother if she would sleep with Robert Redford for a million dollars. Then you ask your sister if she would sleep with Brad Pitt for a million dollars. Then you ask your brother if he would sleep with Tom Cruise for a million dollars.”
So the boy goes up to his mom and asks her if she would sleep with Robert Redford for a million dollars and the mother replies “Oh my god, of course I would, he is so good looking!”
So the boy moves on and asks his sister if she would sleep with Brad Pitt for a million dollars, and she replies “He is so fine, of course I would!”
Then last but not least he goes up to his brother and asks him if he would sleep with Tom Cruise for a million dollars, his brother says “Of course I would, who wouldn’t for a million bucks?”
So he goes up to his dad and says, “I think I learned the difference between potentially and realistically”
“Well what’s the difference?” says the father.
“Well, potentially we’re sitting on 3 million dollars, realistically we’re living with 2 sluts and a fag!”