The last-minute nature of the cancellation made Charles look weak and disrespected, but, suffering from cancer himself, he gets it, sources say.

Kate, who shares three young children with William, has made a gradual return to public engagements this year since announcing in January that she is in remission from cancer. Kate has not shared details of the type of cancer with which she was diagnosed, though she has shared she underwent chemotherapy treatment.

Kate, the Princess of Wales, canceled plans to attend the Royal Ascot horse race as she continues her recovery from cancer.