If possible, let the player ask - not the parent. Let the coach see that he cares enough to want to improve.
If the question comes from the father, it looks like he is taking the initiative instead of the player.
Give the player the coach's contact info and have him ask. It's a little intimidating, but a good habit to get him into.
It's one of the best lessons my son learned at 13U. His coach at the time was a real old school former college coach. He wouldn't discuss "baseball" matters with parents, only with players. He made it very clear that he expected the players to learn to be responsible for communicating issues with him.