If you’re someone who’s mothered a famous hockey player, chances are that you have not subsequently gone out and written a book about it. Is this because your parental pride is more private than, say, a father’s, your fulfillment so much the quieter? Or because you don’t feel the same urgent need to explain your son? Maybe. In the teeming library devoted to our beloved winter game, the books of hockey-parent lit may only fill a half-shelf, but this we know: almost all of them are written by fathers.