On August 15, 1998 — In the Reds-Expos game, two pairs of brothers face each other, and three out of four go deep. Vladimir Guerrero and Wilton Guerrero homer for the Expos while Bret Boone hits a solo shot for the Reds. Aaron Boonefollows with a strikeout, but the Reds win, 6 – 4.

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Source:
Baseball Reference August 15
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game