![USA Baseball on Twitter: "Happy birthday to The Kid, Ken Griffey Jr. 🎉 https://t.co/zpUlLv2A0w" / Twitter USA Baseball on Twitter: "Happy birthday to The Kid, Ken Griffey Jr. 🎉 https://t.co/zpUlLv2A0w" / Twitter](https://pbs.twimg.com/media/FEwfvMYWUAAWaYj.jpg)
USA Baseball on Twitter: "Happy birthday to The Kid, Ken Griffey Jr. 🎉 https://t.co/zpUlLv2A0w" / Twitter
![On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father-son teammates in MLB history | MLB.com On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father-son teammates in MLB history | MLB.com](http://mlb.mlb.com/assets/images/2/3/0/146249230/cuts/GettyImages_57050435_gdzcap1h_o1l927ja.jpg)
On Aug. 31, 1990, Ken Griffey Jr. and Sr. became the first father-son teammates in MLB history | MLB.com
![Ken Griffey Jr. | Major League Baseball, News, Scores, Highlights, Stats, and Rumors | Bleacher Report Ken Griffey Jr. | Major League Baseball, News, Scores, Highlights, Stats, and Rumors | Bleacher Report](http://pbs.twimg.com/media/FqpGrNmX0Ag0vuN.jpg)
Ken Griffey Jr. | Major League Baseball, News, Scores, Highlights, Stats, and Rumors | Bleacher Report
![National Baseball Hall of Fame and Museum ⚾ on Twitter: "Team USA hitting coach Ken Griffey Jr., right, watches Kyle Schwarber's HR along with Mookie Betts (left) and J.T. Realmuto on Saturday National Baseball Hall of Fame and Museum ⚾ on Twitter: "Team USA hitting coach Ken Griffey Jr., right, watches Kyle Schwarber's HR along with Mookie Betts (left) and J.T. Realmuto on Saturday](https://pbs.twimg.com/media/FrDl2MZWwAAb6CL.jpg)
National Baseball Hall of Fame and Museum ⚾ on Twitter: "Team USA hitting coach Ken Griffey Jr., right, watches Kyle Schwarber's HR along with Mookie Betts (left) and J.T. Realmuto on Saturday
![Team USA players watch in awe as MLB-great Ken Griffey Jr. takes batting practice at World Baseball Classic | Fox News Team USA players watch in awe as MLB-great Ken Griffey Jr. takes batting practice at World Baseball Classic | Fox News](https://a57.foxnews.com/static.foxnews.com/foxnews.com/content/uploads/2023/03/1200/675/Team-USA-Ken-Griffey.jpg?ve=1&tl=1)