Even though things haven't been great between Prince Harry and Prince William, the brothers looked like they put their differences aside at Prince Philip's funeral.
"The procession choreography, in retrospect, was a mistake," historian Robert Lacey, author of Battle of Brothers, told PEOPLE about their reunion. "As we saw, they could have walked side-by-side quite happily after all. What pleased me afterward was that it all seemed so totally natural, and they drifted to each other like the old days."
According to royal expert Katie Nicholl, she believes that Kate played an important part in getting William and Harry back together.
"They were very tense as they walked into that chapel," Nicholl shared. "As they came out of it, you could see some tension diffused. And I think that was largely down to the Duchess of Cambridge, who made a point of speaking to Harry and when she did that, you can see them visibly relax."
Nicholl continued, "It's always been my understanding that behind the scenes, Kate has tried very hard to forge a rapprochement and act as a peacemaker between William and Harry. She loves Harry. She says that she is the sister that he never had. She has been heartbroken to see them fall out, and I think she is one of the few people, one of the few family members who would actually be able to push the brothers together, which she did in a very subtle way, but was very effective."
Even though Harry, 36, dropped some major bombshells during his tell-all interview with Oprah Winfrey, it seems like his relationship with his older brother may improve slowly but surely.
"It has been a very difficult time," an insider said. "The Duke was the head of the family, and if there were any time they were going to come together, it's now."