A book about the biology of men in general, not just sons. My husband told me that he could have written the book himself. Mostly about how men communicate differently than woman and how a mom needs to give her son space and not act like a nagging wife/mom to him.
This is an absolute must read for parents of boys. It literally changed the way I saw my boys and I used it as an instruction manual to raise strong, independent, yet loving young men.