Sisters Princess Alexandra, the future Queen of the United Kingdom and Princess Dagmar of Denmark, future Empress of Russia. Hence the similarities of their sons, King George V and Tsar Nicholas II. Actually Alexandra was the Empress of russia.
Princess Alice of Greece & her son Prince Philip in After having 5 children & suffering a mental breakdown she became a nun. During World War 2 she hid Jews from the Nazis in her Athens house and was later declared Righteous Among The Gentiles.