
Snapshot of
Duffy, Daddy and
Uncle John in front of the delivery van for
Elmgrove Market, location unknown.
There's an Elmgrove in Ontario and several Elm Groves in the United States, including Illinois, Iowa, Kansas, Louisiana, North Dakota, Oklahoma (2), West Virginia and Wisconsin. Alternatively, the market may have been merely located near a place known for its elms.

If you recognize the brothers, one of them
John - possibly
John Duffy or the
John C. Murphy mentioned above - who owned
Elmgrove Market, and a son, presumably, of one or the other, nicknamed
Duffy, please share your information in a comment, for the benefit of others.