Just finished the book 
Coached for Life. It is about a pair of coaches of a football team in Montana, 1962, and how they influenced their players throughout their lives.
http://www.coachedforlife.com
http://www.amazon.com/Coached-Life-Ed-Flaherty/dp/0615278825
I highly recommend it. But that's not why I posted this.
Near the end of the book, there is a 40 year reunion of the team.  All the players are there, and they have all told there stories, and finally the mic goes to the old coach.  He says a few words, but this is what he says that really made an impact on me:  "It is a privilege to coach another man's son."  He goes on to say that many times he was spending more time with a kid than his own parents.
So I say, "It is a privilege to teach your children!"