This family has the most beautiful eyes, particularly the younger daughter in the corner (It's easier to see at a larger size) and I absolutely adore the two (older?) boys' little outfits. The ties and the little boy's plaid skirt are so adorable.
The picture is exceptionally clear too (with the exception of the little boy, who must have moved a little while the picture was being taken), though, again, it's better seen at a larger size.
No names or date, unfortunately, but I'd place it in the 1890's. Maybe late 1880's.