You may not expect a billionaire and former CEO of Sun Microsystems to take on the role of caddy for a few rounds of golf, but Scott McNealy has some solid reasoning.

That’s because his son, Maverick, a freshman at Stanford University, is the golfer.

The younger McNealy will be playing at none other than the U.S. Open at Pinehurst starting Thursday, having qualified for a spot earlier this month. His dad, a golf enthusiast in his own right and a former golf captain at Harvard, couldn’t help tagging along.

And, hey, Father’s Day is coming up soon, so there’s nothing like a little father-son bonding on one of the biggest stages — or courses — in sport.

In an interview with Golf Week, Maverick McNealy said of his father: “Really, he taught me to love the game. He taught me everything.” Scott McNealy quipped back: “I taught him until he started to kick my butt.”

For the elder McNealy, the pride in his son’s accomplishments — he has three others — has been well-documented. He’s been tweeting about his caddy role to his more than 10,000 followers.

Below is a collection of McNealy’s public musings as he gears up for the North Carolina tournament.