On August 19, 1992 ā When Bret Boone takes the field at Camden Yards against Baltimore, the Mariner second baseman becomes part of the first three-generation family to ever play in the major leagues. The 23 year-old Seattle rookie is the grandson of Ray Boone (1948-60) and son of Bob Boone (1972-90).
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Sources:
Baseball Reference August 19
National Pastime August 19
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game