I've been reading the book, "Raising Boys: Why Boys are different." The book had an intriguing section where it said that up to age six, boys needs to learn to love and the mom usually helps with that. But then when boys turn six, it becomes much more important for the father to become involved (see screenshot below for details).

I'm wondering if anyone has experienced or seen this? Either as a kid, or with a brother, or with your own son.