Thompson's older brother, Mychel, played basketball for Pepperdine University and had a brief stint in the NBA with the Cavaliers, while his younger brother, Trayce, became a Major League Baseball player. Thompson faced controversy when he was suspended for his final regular season game at WSU after being issued a misdemeanor criminal citation for marijuana possession.[125][126][127] After winning the NBA championship in 2015, Thompson and his father became the fourth father-son duo to win an NBA title, joining Matt Guokas Sr. and Jr., Rick and Brent Barry, and Bill and Luke Walton.[128]