Erasmo Gambino isn't their brother he's married to the Gambino's sister Giovanna (Joanne). There are the 3 brothers John, Rosario (Sal) and Joe. Erasmo is their brother in law and so is Emanuel Gambino. Emanuel Gambino is John Gambino's wife Vittoria's brother. Not the Emanuel Gambino that was murdered in the 70's but a different one.

I'm not positive but the Joe Gambino in the Sinatra picture i'm pretty sure is "Joe From the Bronx" Gambino.