FILE - In this June 13, 1987 file photo, Britain's Queen Elizabeth rides in an open coach with her great-grandson, Prince William, and his mother Diana, Princess of Wales, during the Queen Mother's 87th birthday anniversary parade in London. Prince William is spending the latter half of his four-day stay in Japan, starting Saturday, Feb. 28, 2015 in the country's tsunami-ravaged northeast, a visit certain to draw global attention to the stories of survival and continuing suffering in the region. Memories of William's mother, who died in 1997, are everywhere. The media in Japan, a culture that traditionally values male heirs, have been referring to him as "Diana's first-born son," as though that was more important than his being second in line to the throne. (AP Photo/Gill Allen, File)