Herbert William Small (b.1918) in the back row, far left. Appears to be 10-11 years of age.
Rodney Hollar in the back row, far right, the tallest of the group.
Robbie Small (b.1925) wearing white leggings, directly in from of Herbert.
James Small (b.1922), wearing a dark sweater, to the right of Robbie.

ID courtesy of David Allen Small

Birdhouse (there are two) is the same or similar to the one seen here
https://pbase.com/jtsmall/image/100131005