A Family Picnic, about 1900. The Bronx, New York City
The food suggests they are Italian, it looks like an extended family, perhaps brothers, their wives and children. The photo likely was taken about 1900 near the Clason Point Photography Studio of Grandfather Tom Griffin (1867-1955)
Source : https://www.flickr.com/photos/30484128@N03/5938572334/in/pool-912056@N21