Kate Middleton is reportedly set to act as a peacemaker between Prince Harry and Prince William following their rift.The Duchess of Cambridge, 39, is understood to be helping brothers Harry, 36, and 38 year old William put on a “unified” front for the Queen following Prince Philip’s death. Duchess of Sussex Harry returned to the UK from the US earlier this week, while his pregnant wife Meghan Markle remains in the US following physician’s advice.