Ken Griffey Sr. and Jr. become the first father-son duo to ever

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Vladimir Guerrero joins Vladimir Sr. as first father-son Home Run Derby winner

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

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!

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Seattle Mariners Ken Griffey Sr. / Ken Griffey Jr. Rare Vintage Throwback Father & Son Duo Cards for Sale in Federal Way, WA - OfferUp

Ken Griffey Sr. and Jr. become the first father-son duo to ever play together