Prince William, Prince Harry and other royal family members share heartfelt tributes for Prince Philip

All weekend long, heartfelt tributes have poured into the U.K. from around the world, honoring the life and legacy of Prince Philip, Queen Elizabeth II's husband of more than 70 years, after his death at age 99 on Friday. Britain is now in an eight-day period of national mourning. 

One by one, members of the royal family, including Philip's children and grandchildren, have expressed their grief and gratitude for the Duke of Edinburgh, the longest-serving royal consort.