re: National Anthem question

took my son to a lsu game awhile back and during the national anthem he didn't put his hand over his heart and after we sat down - he stated that people get this confused with the pledge of allegiance when one is supposed to put their hand over their heart. So I whispered to him that if you ever want to attend a sporting event with me that I better see your hand over your heart or that will be the last time we go to a sporting event. I told him I did a piss poor job of raising him. We were fine after that.
I was like wtf though.

I went to various websites to confirm and most stated that military personal salute, men/women with sport caps should remove them and place hands on heart as well as everyone else.