Not every 18 year-old is going to want to play on his dad's team (even if on the opposite squad), or go to the home town University...
Still, I think it would be better if he picks someone other than Ohio, that he picks someone that doesn't play Ohio. It would be a bad thing to put dad in a position of trying to blitz and sack his own son, especially if the result was an injury. Conversely if would also be bad for son to show how to torch dad's defense.