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First father-son duo to play on the same MLB team at the same time

First father-son duo to play on the same MLB team at the same time
Who
Ken Griffey Jr., Ken Griffey
What
First
Where
United States (Seattle,)
When
31 August 1990
Ken Griffey and his son Ken Griffey, Jr (both USA) became the first father-son duo to play on the same Major League Baseball (MLB) team at the same time, on 31 August 1990. They took the field consecutively for the Seattle Mariners against the Kansas City Royals at Kingdome in Seattle, Washington, USA, and hit back-to-back singles. The Mariners went on to win the game 5–2.