Wilhelm II 1859 – 1941 Maternal great-grandfather Augusta Victoria of Schleswig-Holstein 1858 – 1921 Maternal great-grandmother George I of Greece 1845 – 1913 Paternal great-grandfather Olga Constantinovna of Russia 1851 – 1926 Paternal great-grandmother Juan Carlos I of Spain Born 1938 Brother-in-law Queen Sofía of Spain Born 1938 Sister Ernst August, Duke of Brunswick 1887 – 1953 Maternal grandfather Princess Viktoria Luise of Prussia 1892 – 1980 Maternal grandmother Frederick III, German Emperor 1831 – 1888 Paternal great-grandfather Victoria, Princess Royal 1840 – 1901 Paternal great-grandmother MH Monika, Princess of Hanover 1929 – 2015 Relative
Ernst August, Prince of Hanover 1914 – 1987 Maternal uncle PS Princess Ortrud of Schleswig-Holstein-Sonderburg-Glücksburg 1925 – 1980 Maternal aunt
Paul of Greece 1901 – 1964 Father Frederica of Hanover 1917 – 1981 Mother Prince Georg Wilhelm of Hanover 1915 – 2006 Maternal uncle Princess Sophie of Greece and Denmark 1914 – 2001 Maternal aunt Frederik IX of Denmark 1899 – 1972 Father-in-law Ingrid of Sweden 1910 – 2000 Mother-in-law Alexander of Greece 1893 – 1920 Paternal uncle Aspasia Manos 1896 – 1972 Paternal aunt Constantine II of Greece 1940 – 2023 Queen Anne-Marie of Greece Born 1946 Wife Constantine I of Greece 1868 – 1923 Paternal grandfather Sophia of Prussia 1870 – 1932 Paternal grandmother Princess Irene, Duchess of Aosta 1904 – 1974 Paternal aunt Prince Aimone, 4th Duke of Aosta 1900 – 1948 Paternal uncle Ernst August, Crown Prince of Hanover 1845 – 1923 Maternal great-grandfather Thyra, Crown Princess of Hanover 1853 – 1933 Maternal great-grandmother Princess Katherine of Greece and Denmark 1913 – 2007 Paternal aunt Richard Brandram 1911 – 1994 Paternal uncle Princess Alexia of Greece and Denmark Born 1965 Daughter Carlos Morales Quintana Born 1970 Son-in-law Pavlos, Crown Prince of Greece Born 1967 Son Marie-Chantal, Crown Princess of Greece Born 1968 Daughter-in-law Princess Theodora of Greece and Denmark Born 1983 Daughter MK Matthew Kumar Born 1984 Son-in-law
Princess Tatiana Blatnik Born 1980 Former daughter-in-law Prince Nikolaos of Greece and Denmark Born 1969 Son CV Chrysí Vardinogiánni Born 1981 Daughter-in-law
Prince Philippos of Greece and Denmark Born 1986 Son PD Princess Nina of Greece and Denmark Born 1987 Daughter-in-law
Prince Welf Heinrich of Hanover 1923 – 1997 Maternal uncle AH Alexandra von Hannover 1937 – 2015 Maternal aunt
PH Prince Christian Oscar of Hanover 1919 – 1981 Maternal uncle
MD Mireille Dutry Born 1946 Maternal aunt
Infanta Elena, Duchess of Lugo Born 1963 Niece Prince Heinrich of Hanover Born 1961 Maternal cousin Princess Elisabeth of Romania 1894 – 1956 Relative George II of Greece 1890 – 1947 Paternal uncle Alexandra of Yugoslavia 1921 – 1993 Paternal cousin Felipe VI of Spain Born 1968 Nephew Helen of Greece and Denmark 1896 – 1982 Paternal aunt Carol II of Romania 1893 – 1953 Relative Infanta Cristina of Spain Born 1965 Niece Princess Irene of Greece and Denmark 1942 – 2026 Sister Prince Amedeo, 5th Duke of Aosta 1943 – 2021 Paternal cousin Michael I of Romania 1921 – 2017 Paternal cousin Prince Constantine Alexios of Greece and Denmark Born 1998 Grandson PH Prince Ludwig Rudolph of Hanover 1955 – 1988 Maternal cousin
Alexandra, Princess of Leiningen Born 1959 Maternal cousin Prince Achileas-Andreas of Greece and Denmark Born 2000 Grandson EH Ernst August, Prince of Hanover Born 1954 Maternal cousin
PH Princess Olga of Hanover Born 1958 Maternal cousin
MH Marie of Hanover Born 1952 Maternal cousin
Prince Welf Ernst of Hanover 1947 – 1981 Maternal cousin PH Prince Georg of Hanover Born 1949 Maternal cousin
PH Princess Friederike of Hanover Born 1954 Maternal cousin
PD Prince Odysseus-Kimon of Greece and Denmark Born 2004 Grandson
Princess Maria-Olympia of Greece and Denmark Born 1996 Granddaughter PD Prince Aristidis-Stavros of Greece and Denmark Born 2008 Grandson
CH Caroline-Luise von Hannover Born 1965 Maternal cousin
MH Mireille von Hannover Born 1971 Maternal cousin
PB Paul Brandram 1948 – 2020 Paternal cousin
CG Carlos Morales y de Grecia Born 2005 Grandson
AG Amelia Morales y de Grecia Born 2007 Granddaughter
AG Arrietta Morales y de Grecia Born 2002 Granddaughter
AG Ana-Maria Morales y de Grecia Born 2003 Granddaughter
CH Christian Freiherr von Humboldt-Dachroeden Born 1943 Maternal cousin
PD Prince Kimon of Greece and Denmark Born 2026 Grandson