Thanks, Troll,

An alternate way of singing the chorus, to make it gender inclusive, was suggested by a man who led a Yiddish workshop at NW Folklife Festival in 1999 or 2000:

Un mir zainen ale brider, Oi, oi, schwester, brider, Un mir zingen freileche lider, Oi, oi, oi!

BTW, for people not familiar with the song, I understand it is an old labor movement song. But it works beautifully as a peace and good will song, too.
Genie