Hidden people in photographs

I love looking at old photographs.  They tell you so much about the person, where they lived, when they lived, and in some cases how they lived.  It is a bonus when you are related to them too.  I spent hours looking a pictures as a child trying to determine which features had been passed down to me and my parents. 

Last year a cousin of my father-in-law was kind of enough to share some photographs with me of their side of the family.  One of them was a large family portrait, supposedly taken at the family house in Connecticut.  The picture was not labeled, but family tradition says that it is George and Augusta Bennett with their children, children's spouses, and grandchildren at that time.

What an amazing photograph!  I originally guessed that the image was taken in the 1910-1920 time frame. Anyone have any idea if I am correct?  The reason I am asking is that I am not sure it could be George and Augusta after all.  Look at the dates below, for there to be grandchildren I think that this picture must have been taken in the 1920's at the earliest.  Would those clothes be appropriate for that time?

The family (as I have it today) is:
George Bennett and Augusta Jahnke (both born 1872 in NYC)
George Jr (born 1897 in NYC) married Ruby Taylor
Walter (born 1900 in NYC) married Margaret Unknown
Frank (born 1902 in NYC) married Mildred Unknown
James (born1905 in NYC) married Unknown
Maire (born 1909 in NYC) married Unknown
Marian (born 1913 in Connecticut) married Frank Acebal

Looks like I need to do some research on the siblings to find out who their spouses and children were. If this picture is from before 1917 my husband's grandfather and his siblings are not in it.

I have looked at it dozens of times, trying to place who might be who in the image.  Then, the other day I noticed something odd in the picture.  There is a young boy peeking out from behind a tree in the middle of the picture!  Now who in the world could that be sneaking around?

Look... more questions to answer!