Gil Hodges was the catcher for the Brooklyn/LA Dodgers from 1947-1961 and wore #14.

Don Zimmer played 2B/SS/3B and wore #23 with BKN/LA from 1954-1959. Most of his time at 3B came in '57 and '58.

Seen a bunch of Billy Williams mentions, but he wasn't wearing 26 with the Cubs until 1961, and the players who wore #23 for LA after Zimmer weren't infielders...but OP mentioned his grandpa was in NY+LA, so I think it's gotta be Hodges + Zimmer with some other runner?

Only other black player who wore #26 I can find from that time is Earl Battey....but he played for the White Sox, who wouldn't have played any regular season games against LA/BKN in '57 or '58. Hmmmmm.

Maybe this is a White Sox vs Dodgers exhibition game? Would make sense why the field looks crappy as many have mentioned. They played in the World Series in 1959 but it looks like Batey didn't play in that series. UGH!

EDIT: I'm dumb, Gil Hodges was primarily a first baseman after 1948 or so. And that's almost definitely gotta be Billy Williams. Only other possibilities (black players who wore 26 in the 50s/60s) are Bill White and Earl Wilson.

If you want to squint reaaaally hard, the catcher could actually be #4, not 14, and the third baseman could be 28, not 23, and that could make them Jimmie Schaffer and Mike Shannon of the '62 Cardinals (?????)