LeBron James, 34, is seen jumping up and down as Bronny plays on Saturday

Bronny, 15, plays for California's Sierra Canyon Trailblazers and his dad played for St. Vincent-St. Mary Irish who were at home in Columbus, Ohio

With a timeout, James walked halfway on to the court, calling, 'Let's go! Let's go!' 

The Lakers star said watching Bronny 'play the best game of his young high school career... was a story book moment' 

He attended the game with his wife, daughter, mother, sister-in-law, father-in-law, cousins, plus other family and high school friends who were teammates