- Only son of Tsar Nicholas II (1868 - 1918) and Tsarina Alexandra (1872 - 1918). Heir to the Russian throne.
- Younger brother of Grand Duchess Olga (1895 - 1918), Grand Duchess Tatiana (1897 - 1918), Grand Duchess Maria (1899 - 1918) and Grand Duchess Anastasia (1901 - 1918 ).
- Grandson of Czar Aleksandr III (1845 - 1894), the Dowager Empress Czarina Maria Fyodorovna (1847-1928), Louis IV, Grand Duke of Hesse (1837-1892) and Princess Alice of the United Kingdom (1843 - 1878).
- Nephew Grand Duke Alexander Alexandrovich of Russia (1869-1870), Grand Duke George Alexandrovich of Russia (1871-1899), Grand Duchess Xenia Alexandrovna of Russia (1875-1960), Grand Duke Michael (1878 - 1918), Grand Duchess Olga Alexandrovna of Russia (1882-1960), Princess Victoria of Hesse and by Rhine (1863-1950 ), Princess Elisabeth of Hesse and by Rhine (1864-1918), Princess Irene of Hesse and by Rhine (1866-1953), Ernest Louis, Grand Duke of Hesse (1868-1937), Prince Friedrich of Hesse and by Rhine (1870-1873) and Princess Marie of Hesse and by Rhine (1874-1878).
- Great-grandson of Tsar Alexander II (1818 - 1881), Maria Alexandrovna (Marie of Hesse) (1824 - 1880), Prince Albert (1819-1861) and Queen Victoria (1819-1901).
- Great-nephew of Queen Alexandra (1844-1925) and King George of Greece (1845-1913).
- After he got into an accident in Siberia, he never walked again, as a few months later Alexei and his family were executed.
- From his birth to his death, he was the most important child in Russia.
- 1st Cousin of Princess Irina Alexandrovna of Russia (1895 - 1970), Prince Andrei Alexandrovich of Russia ( (1897 - 1981), Prince Feodor Alexandrovich of Russia (1898 - 1968)(, Prince Nikita Alexandrovich of Russia ((1900 - 1974), Prince Dmitri Alexandrovich of Russia (1901 - 1980), Prince Rostislav Alexandrovich of Russia (1902 - 1978), Prince Vasili Alexandrovich of Russia (1907 - 1989), George Mikhailovich, Count Brasov, Tikhon Nikolaevich (1917-1993), Guri Nikolaevich (1919-1984), Princess Alice of Battenberg (1885 - 1969), Louise Mountbatten (1889 - 1965, )George Mountbatten, 2nd Marquess of Milford Haven ((1892 - 1938), Louis Mountbatten (1900 - 1979), Prince Waldemar Wilhelm Ludwig Friedrich Viktor Heinrich of Prussia ((1889-1945), Prince Wilhelm Viktor Karl August Heinrich Sigismund of Prussia (1896-1978), Prince Heinrich Viktor Ludwig Friedrich of Prussia (1900-1904), Princess Elisabeth of Hesse and by Rhine (1895-1903), stillborn, (1900-1900), Georg Donatus, Hereditary Grand Duke of Hesse (1906-1937) and Louis, Prince of Hesse and by Rhine (1908-1968).
- Second cousin of Irina Yusupova (1915 -1983), Princess Xenia Andreevna of Russia ( 1919 - 2000), Prince Michael Andreevich of Russia 1920 - 2008), Prince Andrew Romanov (b. 1923), Olga Romanoff (b. 1950), Prince Michael Feodorovich of Russia (1924 - 2008), Princess Irene Feodorovna ( (b. 1934), Prince Nikita Romanov (1923 - 2007), Prince Alexander Romanov ( (1929 - 2002), Princess Nadejda Dmitrievna (1933 - 2002), Prince Rostislav Romanov (1938-1999), Prince Nicholas Rostislavovich ((1945 - 2000), Princess Marina Vasilievna (b. 1940), Olga Kulikovsky (b. 1964), Xenia Kulikovsky (b. 1941), Leonid Kulikovsky (1943-2015), Alexander Kulikovsky (b. 1948), Princess Margarita of Greece and Denmark (1905 - 1981), Princess Theodora of Greece and Denmark (1906-1969), Princess Cecilie of Greece and Denmark (1911 - 1937), Princess Sophie of Greece and Denmark (1914 - 2001), Prince Philip (b. 1921), stillborn (1925-1925), Lady Tatiana Elizabeth Mountbatten (1917 - 1988), David Mountbatten, 3rd Marquess of Milford Haven (1919 - 1970), Patricia Mountbatten (1924 - 2017), Pamela Hicks (b. 1929), Princess Barbara of Prussia (1920 - 1994) and Prince Alfred Friedrich Ernst Heinrich Conrad of Prussia (1924 - 2013).
- Third cousin of Countess Xenia Nikolaevna Sheremeteva (b. 1942), Prince Alexis Andreevich Romanov (b. 1953), Prince Peter Andreevich Romanov (b. 1961), Prince Andrew Andreevich Romanov (b. 1963), Nicholas Mathew (b. 1976), Francis Mathew (b. 1979), Alexandra Mathew (b. 1981), Thomas Mathew (1987 - 1989), Prince Michael Mihailovich (1959 - 2001), Joelle Soulas (b. 1966), Alain Pelle (b. 1956), Prince Fedor Nikitich Romanoff (1974-2007), Théodore Nikitich de Russie (1974-2007,), Penelope Allen (b. 1953), Marina Allen (b. 1955), Alexandra Allen (b. 1958 ), Princess Stephena Rostislavovna Romanov (b. 1963), Princess Alexandra Rostislavovna Romanov (b. 1983), Prince Rostislav Romanov (b. 1985), Prince Nikita Rostislavovich Romanov (b. 1987), Nicolas Romanov (b. 1968), Daniel Romanov (b. 1972), Heather Romanov (b. 1976), Tatiana Beadleston (b. 1968) Alexandra Beadleston (b. 1970) Nicholas Beadleston (b. 1971) Natalie Beadleston (b. 1976), Peter Cordeiro (b. 1994), Paul Kulikovsky (b.1960), Vivian Larsen ( b. 1962), Peter Larsen (b. 1966), Vibeke Nielsen (b. 1981), Stillborn (1933-1933), Kraft, Prince of Hohenlohe-Langenburg (1935 - 2004), Princess Beatrix Alice Marie Melita Margarete of Hohenlohe-Langenburg (1936 - 1997), Prince Georg Andreas Heinrich of Hohenlohe-Langenburg (b. 1938), Prince Rupprecht Sigismund Philipp Ernst of Hohenlohe-Langenburg (1944 - 1978), Prince Albrecht Wolfgang Christoph of Hohenlohe-Langenburg (1944 - 1992), Princess Margarita of Baden (1932 - 2013), Maximilian, Margrave of Baden (b. 1933), Prince Ludwig Wilhelm Georg Ernst Christoph of Baden (b. 1937), Prince Ludwig of Hesse and by Rhine (1931 - 1937), Prince Alexander of Hesse and by Rhine (1933-1937), Princess Johanna of Hesse and by Rhine (1936 - 1939), Stillborn (1937-1937), Princess Christina Margarethe of Hesse (1933 - 2011), Princess Dorothea of Hesse (b. 1934), Prince Karl of Hesse (b. 1937), Prince Rainer Christoph Friedrich of Hesse (b. 1939), Princess Clarissa Alice of Hesse (b. 1944), Prince Welf Ernst of Hanover (b. 1947 - 1981), Prince Georg of Hanover (b. 1949), Princess Friederike of Hanover ((b. 1954), King Charles III (b. 1948), Princess Anne (b. 1950), Prince Andrew (b. 1960) and Prince Edward (b. 1964).
- 4th cousin of Tatiana Sfiris (b. 1968), Princess Natasha Catherine Romanov (b. 1993), Thomas (b. 2004) Lucy (b. 2006) Isabella Florence (b. 2011), Tatiana Alexandra (b. 1986), Prince Rostislav Romanov (born 1985), Princess Cécile Marita Dorothea of Hohenlohe-Langenburg (b. 1967), Philipp, Prince of Hohenlohe-Langenburg (b. 1970), Princess Xenia Margarita Anne of Hohenlohe-Langenburg (b. 8 July 1972), Prince Michael Galitzine (b. 1993), Princess Victoria Galitzine (b. 1984)., Princess Katarina of Yugoslavia (b. 1959), Prince Nikola of Yugoslavia (b. 1958), Prince William of Wales (b. 1982), Prince Harry (b. 1984), Peter Phillips (b. 1977), Zara Tindall (b. 1981), Princess Beatrice (b.1988), Princess Eugenie (b. 1990), Lady Louise Windsor (b.2003) and James, Viscount Severn (b. 2007).
- Fifth Cousin Victoria Marie Esmé Margarita de Silva (b. 1991), Princess Marija of Yugoslavia, b. 1993), Prince George of Wales (b. 2013), Princess Charlotte of Wales (b. 2015), Prince Louis of Cambridge (b. 2018 ), Archie Mountbatten-Windsor (b. 2019), Savannah Anne Kathleen Phillips (b. 2010), Isla Elizabeth Phillips (b. 2012), Mia Grace Tindall (b. 2014) and Lena Elizabeth Tindall (b. 2018).
- 6th Cousin Louis Ivan Welf Otto Hooper (b. 2007), Konstantin Georg Erik Falk (b. 2007), Leopold Welf Christian Falk, (b. 2009).
- Baptism date was 24 August, 1904. Was baptised in the Peterhof Palace.
- Was only a few weeks old when it was realized he had hemophilia, a blood disorder transmitted only to sons from a mother who inherited the gene (Tsarina Alexandra inherited it from her grandmother Queen Victoria). The family kept this a secret as much as possible. Mostly the family referred to Alexei's disease as "Alexei's problem.".
- Second cousin, once removed of Princess Nina Georgievna of Russia, Princess Xenia Georgievna of Russia and Prince George of Greece.
- When it was publicly disclosed that he was seriously ill in 1912, many of the Russian people blamed his mother. However it was never disclosed that Alexei had hemophilia.
- His pets were: Boika (Dog), Joy (Dog - King Charles Spaniel), Kot'ka (cat - furry cat), Vanka (donkey), Voyeikov (Cat - Big Gray Cat) and unnamed elephant.
- In 2009 genetic analysis determined specifically that he suffered from hemophilia B.
- His skeletal remains went undiscovered until 2007.
- After he got into an accident in Siberia, he never walked again, as a few months later Alexei and his family were executed.
- From his birth to his death, he was the most important child in Russia.
- Was very close to his older sister, Grand Duchess Anastasia.
- Friend of Kolya Derevenko (1905 or 1999), Leonid Sednev (1903 - 1942), Vasya Agayev, Zhenya Makarov, Alexander Derevenko and Sergei Derevenko.
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