Grandson_3 had his sports team game today. According to Son_2, GS3 tried his best. He wasn't aggressive in chasing the ball, but given that his bulkier teammate D will tackle anyone (even teammates) to try to get the ball, I can understand. I think S2 is going to try to arrange a weekly afternoon where GS3 plays with one of his teammates.

It is probably because he's not allowed to act that way when playing with his brothers.

(D was on Grandson_4's team in a different sport and his tackling kept everyone except J from pursuing the ball. GS4, at 30lb, is probably just over half D's weight.)