Father
You want to be a "cool dad", so you like to play and make jokes with your children. You don't like to be too strict with them. You can't understand why your older son likes to study so much. You think he is too serious.
Some things you can say:
"Hey son, how's it hangin'?"
"Okay, you do can do that, but don't tell mom."
"Let's play a family game of basketball!"