I can DEFINITELY see the little boy being Ralph Waldo Emerson's son. Yes, Emerson did have a child, and being the smart and philosophical man that Emerson was, I'm sure his son turned out something like the child in this photo.
We lived behind a church where my little brother was called over to sing in front of the entire congregation. Gary loved singing just like this little boy in the picture Out of the mouth of babes there is perfected praise."Sing Unto The Lord" !