Prince William and Princess Kate are doing everything they can to end their feud with Prince Harry and Meghan Markle, a royal biographer says. William, the crown prince, and Kate, his cancer-stricken wife, have invited Harry andMeghan to Great Britain with their children, Archie and Lilibeth.

A first step in a painful and spectacular feud between the brothers, which her mother, Princess Diana, anticipated as William approached the throne and Harry was deferred. The drama is that the royal family desperately needs more members, with Kate in retirement until doctors clear it, and King Charles III suffering from cancer.