Yes, the Team 91 2017,18, 19 and 20 all have dads coaching. Express teams have been and continue to be filled with dads coaching. The head coach of St. Anthonys coaches his kid's team for the 2020 Express. Jesters 2019 and 2020 have dads coaching.
It isn't a problem to have a coach with a kid on the team, if it's the guy "gets it". There are obviously guys who don't get it, and are fixated on their own kids.
Throwing out a blanket statement that having a coach with a kid on the team is something to always avoid is ignorant.