On August 12, 1965 — The Giants split a pair with Pittsburgh‚ losing game 2 by a 5 – 2 score after winning the opener‚ 4 – 3. In the win‚ Matty and Jesus Alou hit homers‚ the first time two Alous have homered in the same game since Matty and Felipe did it on May 15‚ 1961.

Source:
Baseball Reference August 12
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game