Your son might get some occasional rain bans but no damaging wind as long as Irene stays on the projected path.
. . . . .
I remember there was a hurricane that hit Charlotte 20 years ago. It came in around Charleston, SC and headed right to Charlotte coming in during the night and blew down a lot of trees. It surprised everyone that a hurricane could cause so much damage that far inland. Its mainly because it is so rare so there were a lot of big dense oaks that presented a lot of wind load. Here in Florida the trees don't have dense foliage and survive wind better.