The term 'Member of the British Royal Family' can be summarized by two crossword solutions: ANNE (4 letters) and William (7 letters). ANNE is the Princess Royal, the only daughter of Queen Elizabeth II and Prince Philip, Duke of Edinburgh. She is the seventh holder of the title and the first female to hold it. William is the Duke of Cambridge, the eldest son of Prince Charles and the late Diana, Princess of Wales. He is second in the line of succession to the British throne.