SISTER - Princess Theodora of Greece and Denmark. The second child and daughter of Prince Andrew of Greece and Denmark and Princess Alice of Battenberg and sister of Prince Philip, Duke of Edinburgh. In 1931 she married Berthold, Margave of Baden.
Prince Andrew of Greece and Denmark (great grandson of Queen Victoria of England), and his wife Princess Alice of Battenberg. Parents of Prince Philip, Duke of Edinburgh~husband of Queen Elizabeth II of England.
They were first cousins. Their mothers were sisters. They could almost pass as twins. Tsar Nicholas II of Russia and King George V of England. King George wanted to send help to save the family, but he was not supported by the English government.