On July 14, 1992 Seattle Mariners outfielder Ken Griffey, Jr. homers off Chicago Cubs hurler Greg Maddux, making it the first time in history a father and a son have hit All-Star home runs. His dad hit one off the New York Yankees’ Tommy John in the 1980 All-Star Game. The American League pounds out a record 19 hits in defeating the National League by a score of 13 – 6 in the 1992 All-Star Game. It’s the AL’s 5th straight win. Griffey Jr., who strokes a single, double, and home run, is named the game’s MVP, 12 years after his dad wons the same honor.

Source
Baseball Reference July 14