I coached my son and would argue that it is much harder on the player than it is the coach. I loved every minute of coaching him but there were times when my expectations of him were probably unfair to him in comparison with his teammates. I know that coaches' kids face more scrutiny than others. No matter how good they are, there will be people that say "he only starts or plays or fill in whatever you like because his dad is a coach. I saw in high school when my coach's son was our QB (and was very successful) and I saw it with my son who was one of our better players even though he was definitely not a star. I am sure there are instances when coaches play their own kid more than he deserves but I think it is probably less common than some people believe. Coaches know that they have to win or their jobs are in danger and that means playing the best players. I can see where coaching your son in some situations could cause problems but I never really experienced any. Now that my son is out of high school, we talk about it often and are both grateful for the time we spent together doing something we enjoy.