August 1911. I suspect that the baby on the sled is Eileen Creevey Hall at about a year old. The girl is Carlotta Creevey, the boy with the hat is Kennedy Creevey, the other boy is unknown.
The building in the background is Happy Thought. It still has at least the pump for the old well, the odd little rectangular object. It is interesting to note that the drive is not gravel at this date. The chair was clearly regularly used on the lawn, you can see the runners to avoid the legs sinking in. What looks like a large birch tree is not; it is the big central oak on the lawn (the shadows are odd). The very dark trunk just visible on the left is one of the big maples, they are long gone; but about where that one is there is now a young beech.
Acair Fearann 
I like old photos. There’s just something about them.