Village Store and Post Office
I do not know the identity of the gentleman or the children. A first guess is that it is the proprietor, John R. Peirce. Perhaps someone can affirm or dispute this conclusion.
In addition to the canned goods, there appears to be a stack of buckets and cases of other goods on display. Unfortunately zooming in closer does not allow reading the package labels or small signs on the building, though some letters can be made out.