Prince William, Kate Middleton and Prince Harry
Prince William, Kate Middleton, and Prince Harry during The Patron's Lunch celebrations for The Queen's 90th birthday at The Mall on June 12, 2016, in London. Getty Images/Jeff Spicer

Kate Middleton previously said the nicest things about working with Prince Harry and Prince William. But in recent months, the trio has not collaborated on their royal duties.

In fact, Prince Harry and Meghan Markle announced their split from the Duke and Duchess of Cambridge earlier this year. Prince Harry and Markle created their own foundation called Sussex Royal. Prince William and Middleton, on the other hand, are now handling the Royal Foundation of the Duke and Duchess of Cambridge.

During a previous interview, the mom of three talked about the Heads Together campaign and said that they have worked more effectively on mental health issues because of their teamwork.

“[Mental health] is obviously such a huge topic – although it wasn’t as big as I actually thought it was – but I think it was something that I think all three of us felt that we really could make a far bigger impact together rather than just one of us acting alone on it. The impact they all made with Heads Together was tremendous,” she said.

Middleton went on to say that she has always felt strongly instead of putting ideas together, she, Prince William, and Prince Harry have very different strengths. For instance, Meghan Markle’s husband is knowledgeable when it comes to knife crime, Prince William is knowledgeable about homelessness, and she was focused on addiction.

“I just think to be able to come together to find some sort of common ground, draw ideas together and find a way forward was really exciting,” she said.

Since Middleton had a wonderful time teaming up with Prince Harry, it is possible that she misses working with her sister-in-law. But since Prince Harry is now married to the Duchess of Sussex, they also have to create their own niche in the royal family.

There are also ongoing rumors suggesting that Prince William and Middleton are feuding with Prince Harry and Markle, which makes it more unlikely for them to work together again.