August 31, 1990: Ken Griffey Jr. and Sr. get back-to-back hits in

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Baseball Sisco Kid Style: The Griffeys Play In The Same Game For First Time August 31, 1990

Phungo: ANNIVERSARY: August 31 1990 Griffey & Griffey Jr Join same lineup

On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father-son teammates in MLB history

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Ken Griffey Jr. - Wikipedia

This Day In Sports Clips on X: August 31, 1990: Ken Griffey Jr. and Sr. became the first father-son combo in major league history to take the field together. They would get

Ken Griffey Jr. and Sr. Framed Photo w/ Autographed Post Card JSA Cert Mariners

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Ken Griffey, Jr. Gets To Play With Dad In 1990!

Ken Griffey, Jr. - Students, Britannica Kids

Classic Mariners Games: The Griffeys Hit Back-to-Back Home Runs, by Mariners PR