Britain's monarchy kept its silence on Tuesday, after Meghan Markle and Prince Harry sparked a crisis by alleging that a family member made a racist remark about the colour of their son's skin and that she was alienated to the point of contemplating suicide.

The family, led by Queen Elizabeth, 94, was grappling with how to respond to Oprah Winfrey's TV interview, in which Harry also said that his father, heir-to-the-throne Prince Charles, had let him down...