I'm not sure what you can measure in this photograph by measuring the acreage taken up by the personal space of one particular tousle-haired trouble maker. Everyone on the right side of the photograph seems to be scrunched together, in part out of affection, but also out of necessity to fit into a frame filled mostly with Dean (with his arm around wife Jenny) and those on the left trying not to violate his sphere of domination. If you cut this photo in half, you would have a picture of seven people on one half and a picture of four people on the other (three, as this is a community property state).
It almost looks like he was leaning against the wall with Jenny, and everyone sort of gathered around him for a picture as if he were one of those theme park cutouts. (Have your picture taken with the hipster! He looks so lifelike!)
Hope you had a nice, stress-free Thanksgiving.