Wether the motion blur is intentional or not, IMHO it doesn´t improve this shot as opposed if the motion had been stopped, I at least would have given at least 1 or 2 more points when I scored this if it had been "frozen". Also the backround is distracting to say the least. Framing and colours/contrast are good though.
nice shot but, a bit soft ... I also would have cropped the wandering spare arm out of the left side. That might have required a tighter crop around your main subject but, I think that would have been more effective anyway.
The shot is out of focus/blurry which is distracting. I have a hard time connecting this to family other than you say father in your title and there is a baby in the shot. But I ust don't get family. I get blurry guy in tux with a silly expression on his face holding a baby.
Looks like a little motion blur here. You might want to think about upping the shutter speed (which would have helped with the over-exposure problems as well). Despite the flaws, it's a very touching candid portraiture.