New book reveals Prince William and Kate Middleton's normalcy behind palace doors

British royal family's traditional upbringing examined in the book

The couple fights and calls each other endearing names like "babe" and "Babykins"

William is obsessed with Middleton's hair, and she calls him "baldy" in jest

Middleton has a calm demeanor, and William avoids confrontation

Middleton's stoicism has helped her navigate the royal family's traditions successfully

The couple represents both historic continuity and everyday marriage

They want their kids to have a normal childhood and not be raised like royal kids usually are.

In a 2007 interview with NBC, William disclosed his childhood nickname, "Wombat."