Naman Ramachandran More than a dozen members of the British Royal Family offer their personal thoughts in a new documentary as they pay tribute to the life of His Royal Highness Prince Philip, Duke of Edinburgh, who died in April at 99.All the children of the Queen and the Duke, along with their adult grandchildren and other members of the Royal Family, agreed to take part in Oxford Films’ “Prince Philip: The Royal Family.” Originally conceived to mark Prince Philip’s 100th birthday, the