Not in the Head Coach position, but have had the honor and the privilege of being able to coach all 3 of my sons. I feel there is nothing wrong at any level if you can seperate the athlete from the child. I've always let the HC make final call on starting. Luckily, I'm able to leave the whistle in the truck when I get home and not discuss anything unless my sons bring it up. But there will always be those who question the coaches kid playing over someone else. Happens in the workplace all the time.