During our trip to DC we also got to spend a day with Sean, April, Jackson, and Avery. We went to the park to play.
There were about 6 other kids, mostly 7-10 years old, playing tag. Jackson, almost 4 years old, had no problem loudly introducing himself to the entire playground upon arrival ("Hello, my name is Jackson Michael Cross!") and asking if he could play tag with them. His uncle Mike helped him a bit, chasing down a few kids when he was "it", though to be honest I think he really wanted to "play Buzz Lightyear" more than anything.