India, Aug. 9 -- Kate Middleton's part in guiding Prince George toward his future as king will look very different from Prince William's. "She will never have a constitutional role, except as regent in a worst-case scenario, if George becomes king before age 18. She is there to be the loving, supportive mom in everything George does, because he is her son first and foremost," royal historian Marlene Koenig told Us Weekly.

At 43, the Princess of Wales knows exactly what is ahead for her eldest child. She has spent years navigating royal life alongside the man next in line to the throne.

"She and William dated for nearly 10 years before their engagement was announced, which allowed her the time and space to learn about her future life as ...