Genes dictate their rules.
Monarch – they are people too, although of Royal blood. So, nothing human is alien to them. As mere mortals, they are very similar to their grandparents, great-grandparents and other ancestors. British People magazine published an interesting collection, looking at that I wonder the similarity of the current members of the Royal family with the ancestors.
King George VI and Prince Edward.
Young Elizabeth II and lady Louise Windsor.
Frederick Louis, Prince of Wales and Lord Frederick Windsor.
Queen Mary and Prince Harry of Wales.
King Edward I and Prince William.
Queen Victoria and Princess Beatrice.
King Edward VII and Prince Charles.
King George V and Prince Michael of Kent.
Queen mother Elizabeth and Princess Eugenie.
Queen Mary and Queen Elizabeth II.