It’s been one month since Prince Harry and Meghan Markle’s explosive tell-all interview with Oprah Winfrey, but the ripple effects from it are still being felt around the globe and within the royal family.

Now, sources are saying that Harry and his older brother Prince William only talked about one thing after the interview, and that’s the upcoming tribute to their late mother Princess Diana at Kensington Palace this summer.

“The conversation Harry and William had after the big interview didn’t end well. And yes, they agreed over the statue, but communication between them was sparse and over email and WhatsApp,” the source told US Weekly.

Harry is expected to reunite with William in July for the unveiling of a statue of Diana in the gardens of Kensington Palace.

“Harry has so much going on in his life work-wise and is busy planning for the arrival of their daughter that he’s trying not to overthink the consequences that may arise upon his return to the U.K.,” the source says, adding that William has insisted that the brothers meet before the public appearance.

“All eyes will be on them at the unveiling, critics will be analyzing their every move and how they interact with each other,” the insider added. “He doesn’t believe that it’s feasible for them to reunite in the public eye without showing signs of tension if they don’t thrash out their differences in advance.”

William and Harry had commissioned the statue of Diana back in 2017 “to mark the twentieth anniversary of her death and recognize her positive impact in the U.K. and around the world.” Once it got delayed, they changed their plans to have the unveiling mark their mother’s 60th birthday.

“The statue is to reflect on Diana’s legacy, not their feud, and William wants to keep it that way,” the source said. “But Harry is refusing to meet up with William and won’t be bossed around by his brother. His stubbornness is making a bad situation worse.”

This comes after we reported that another source said that William is not happy with how his brother has behaved since stepping down as a royal and moving across the world to California.

“William feels that Harry has gotten too big for his boots since moving to California — that success and Hollywood have gone to his head,” the source said. “He’s already accused [Harry] of putting fame over family after the big interview.”