Ken Griffey Jr. and Sr. hit back-to-back home runs

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

ESPN Stats & Info on Twitter: On this day in 1990, Ken Griffey Jr. and Ken Griffey Sr. hit back-to-back home runs against the California Angels. They were the first father-son duo

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Ken Griffey Sr. and Jr. make history! They hit BACK-TO-BACK home runs!