August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in father-son debut with Mariners – Society for American Baseball Research
When Ken Griffey Sr. humorously 'grounded' Ken Griffey Jr. for catching a fly ball in his territory while playing with the Seattle Mariners
Out of Right Field: To Ken Griffey Jr., Father's Day always meant more
Griffey Jr.'s father recalls son's love of game, celebrates his election to Hall of Fame, New Today
ESPN - On this date in 1990, Ken Griffey Sr. and Ken
Griffey Jr. and Sr. hit back-to-back home runs for Mariners
Griffey Jr. and Sr. hit back-to-back home runs for Mariners
WATCH: Father & son Griffey hit back-to-back HRs
In 1990, the Griffeys became the first father-son pair to play in the same Major League lineup
Sports Vault: 31 years ago, The Kid got his bid
Ken Griffey Sr. and Jr. become the first father-son duo to ever play together
Donora's Ken Griffey Jr. an easy choice for Hall of Fame, Mon Valley
New Era Of Draft Began With Griffey — College Baseball, MLB Draft, Prospects - Baseball America
Ken Griffey Jr. News, Biography, MLB Records, Stats & Facts