Kate Middleton, the mother of Prince George, Princess Charlotte and Prince Louis, reportedly knows how to handle Prince William's temper tantrums.

There’s a joke among the staff that Kate treats William as the fourth because he occasionally behaves like one,” Tom Quinn claimed.

Prince William and Kate Middleton seem more in love than ever—with the recently elevated PDA to prove it!—but that doesn’t mean their marriage is perfect. Royal author Tom Quinn recently told Fox News that the couple—married for 14 years next month and the parents of three kids—have issues just like the rest of us,