the difference between Potentially and Realistically

A son asked his father, �Dad, what's the difference between Potentially and Realistically?�
The Father replied, �If you really want to know, go ask your mother if she'll sleep with Robert Redford for one million dollars, and then go ask your sister if she'll sleep with Brad Pitt for one million dollars. And then go ask your brother if he'll sleep with Tom Cruise for one million dollars, and then come back to me and tell me what you found out.�
So the son goes to his mom and says, �Mom, would you sleep with Robert Redford for a million dollars?� and the mom says �For a Million Dollars, Hell yeah, I would, I've been wanting to forever.�
So the son goes to his sister and asks her if she'll sleep with Tom Cruise for a million dollars and the sister says �Oh man, would I ever. I'd Love To.�
So then the son goes to his brother and says, �Would you sleep with Tom Cruise for a million dollars?� and the brother says, �Hmm...for a million dollars, well...a million dollars is a lot of money, so...yeah I guess I'd do it for a million dollars�
So the boy goes back to his dad and the dad says to his son, �Well, what did you find out?�
His son replies, �Well, we're Potentially sitting on three million dollars, but realistically we're living with two sluts and a fag.�