Klay Alexander Thompson was born in Los Angeles, California, to Julie and Mychal Thompson in 1990. His mother was a volleyball player at the University of Portland and University of San Francisco. His father was the first overall pick in the 1978 NBA Draft and played 12 seasons in the NBA, winning two championships with the Lakers. Klay's older brother, Mychel, appeared in five games with the Cavaliers in 2011-12 and played four seasons with the Santa Cruz Warriors, Golden State's NBA G League affiliate. His younger brother, Trayce, played professional baseball for Los Angeles Dodgers and Oakland Athletics and is currently in the Cleveland Indians organization. Klay attended Santa Margarita Catholic High School in Rancho Santa Margarita, California. As a senior, he led the Eagles to a 30-5 record and the Division III State Championship. He scored 37 points in the state title game, connecting on a state-finals-record seven three-pointers. That season, Thompson earned Division III State Player of the Year honors. He was also named League MVP, first-team Best in the West and an EA Sports Second Team All-American. Along with his family, Thompson co-founded the Thompson Family Foundation with a mission to "enrich the lives of youth in the United States and the Bahamas through fitness and education." In 2017-18, Thompson helped raise over $350,000 for the victims and communities affected by the wildfires in Northern California through his Points With Purpose fundraiser. Thompson also personally donated $75,000 after pledging to donate $1,000 per point he scored during a three-game homestand. The Warriors Community Foundation donated $15,000 in his honor to the Good Tidings Foundation in recognition of his community work. He purchases tickets to every home game that are donated to deserving youth groups. Learn more about Thompson on Twitter (@KlayThompson) and Instagram (@klaythompson).