Men want to be better fathers, and today they're trying harder than ever. They jog behind strollers, leave work early for parent-teacher conferences, and roughhouse with their kids before they've had a chance to change out of their suits.

But many men aren't building the relationships with their sons that they'd hoped for. And sons are finding it hard to confide in fathers who must devote so much of their time to building careers that both keep them from their families and keep their families comfortable. Many fathers admit that they don't have a clue what's going on in their sons' lives,...