On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father

Bobby and Barry Bonds, Ken Griffey Jr. and Ken Griffey Sr.: Baseball fathers and sons – New York Daily News

On this day in 1990, Ken Griffey Sr. and Ken Griffey Jr. became the first father/son duo to play together in a Major League game!

Sports Vault: 31 years ago, The Kid got his bid

This Day in Sports: A Griffey Family Reunion in Seattle - ESPN - SportsCenter.com- ESPN

Griffey Jr. hits 500th home run on Father's Day

August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in father-son debut with Mariners – Society for American Baseball Research

OTD: Griffey Jr. and Sr. Play Together, #OTD in 1990, baseball fans witnessed the ultimate father & son moment in MLB history between the Griffey's., By Stadium

On this date: Ken Griffey Sr. and Jr. play in same game for first time

Griffey Jr.'s father recalls son's love of game, celebrates his election to Hall of Fame, New Today

Ken Griffey Jr Biography