There are great coaches that are dads however it all comes down to daddy ball. Even the most objective minded dad coach cannot truly be objective in the minds of the team. It is a cancer, there is always a player/ family that will take issues with the coach/son dynamic. I have often seen that the objectivity isn't solely between the father and son. There are invariably, friends, neighbors, etc. who's playing time and position are impacted as well. The lacrosse world is filled with dad's and sons. By all accounts Danowski, Sowers, Tierney to name just a few all coached their sons and their success speaks for itself; however, nobody ever talks to the parents and players on those teams to better understand the impact whether good or bad. In theory it can be successful but I think most of us would agree that the situation is less than ideal which is why the original poster likely listed it as a concern.