Kate Middleton has been stepping up ever since Prince Philip passed away on April 9.
"Kate's standing in the Royal Family has now come so far that many believe she is their biggest asset," host Tom Steinfort said on 60 Minutes Australia.
Royal expert Katie Nicholl shared, "I think Kate is the glue. In the same way that the Duke of Edinburgh was always the one who would help resolve family issues. He was the patriarch of the family."
"I see Kate stepping into that role," she added. "Trying to keep things together."
This is hardly the first time Kate, 39, has had to step in. After Philip passed away, the mom-of-three was seen trying to bring her husband, Prince William, and his brother, Prince Harry, back together after the latter aired out his dirty laundry on television.
Kate served as the "peacemaker" between the brothers, Nicholl said.
"They were very tense as they walked into that chapel," Nicholl said of the princes. "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."
According to Nicholl, she believes that Kate "played quite an important role in getting the brothers to the point where they were able to engage in a conversation, of course, in front of the world's press."
"Everyone was watching," she noted. "The focus of the day was absolutely rightly on the Duke of Edinburgh, this was about bidding him a fitting farewell and no one wanted there to be too much attention on William and Harry and this feud — but inevitably the world was watching."