It;s very difficult to completely bring back a blurry picture and more difficult at low resolution. Did my best - added some sharpness to the two figures, blurred the background leaving the foreground a bit sharper, and lightened the overall shot. There was also a blown out highlight near the baby's left ear. Filled that in. Since it is a low resolution, view and/or print at a smaller size. Possibly someone can add a different edit. Hope this works for you.
@coolpauljohnson - you're most welcome. All of us here are very glad to help where we can.
Suggestion - if you have the original shot in a higher resolution, post a link and possibly we can do some deeper sharpening.
Enjoy the kids - they grow up so incredibly fast!