Could be wrong; but it looks to me; like it is Obama’s own, ‘hand on knee’. (And Reggie’s hand on his own leg; beside Obama. Whatever the case; Obama has a dreamy look on his face; as if thinking ‘fast forward’ - to post game activities, perhaps. He so loves it; when he is not with Michelle. And certainly appears; all is well with his world, for sure; when he is close to Reggie.
Nah, you’re wrong. Take a good look at the sleeves of both boys...