On 29 Jan 1912 [his grandfather] Alexander Duff 1st Duke Fife (age 62) died. His daughter [his mother] Princess Alexandra Duff Duchess Fife 1891-1959 (age 20) succeeded 2nd Duchess Fife.
On 15 Oct 1913 [his father] Prince Arthur of Connaught (age 30) and [his mother] Princess Alexandra Duff Duchess Fife 1891-1959 (age 22) were married at Chapel Royal, St James's Palace. She the daughter of Alexander Duff 1st Duke Fife and Louise Windsor Duchess Fife 1867-1931 (age 46). He the son of Prince Arthur Windsor 1st Duke Connaught and Strathearn (age 63) and Luise Margarete Hohenzollern Duchess Connaught 1860-1917 (age 53). They were first cousin once removed. He a grandson of Queen Victoria of the United Kingdom. She a granddaughter of King Edward VII of the United Kingdom.
On 09 Aug 1914 Alastair Windsor 2nd Duke Connaught and Strathearn was born to Prince Arthur of Connaught (age 31) and Princess Alexandra Duff Duchess Fife 1891-1959 (age 23) at 54 Mount Street Grosvenor Square. He was baptised on 01 Sep 1914 at his parent's home. His godparents were his maternal great-uncle George V King United Kingdom (age 49), Alfonso XIII King Spain 1886-1941 (age 28), his maternal great-grandmother Alexandra Glücksburg Queen Consort England (age 69), his grandfather Prince Arthur Windsor 1st Duke Connaught and Strathearn (age 64), his great-aunt Princess Louise Caroline Alberta Windsor Duchess Argyll (age 66) and his cousin Princess Mary Windsor Countess Harewood (age 17). He a great grandson of Queen Victoria of the United Kingdom. Coefficient of inbreeding 3.85%. 
On 12 Sep 1938 [his father] Prince Arthur of Connaught (age 55) died.
On 16 Jan 1942 [his grandfather] Prince Arthur Windsor 1st Duke Connaught and Strathearn (age 91) died at Yattendon Castle [Map]. His grandson Alastair Windsor 2nd Duke Connaught and Strathearn (age 27) succeeded 2nd Duke Connaught and Strathearn.
On 26 Apr 1943 Alastair Windsor 2nd Duke Connaught and Strathearn (age 28) died at Ottawa. He was buried at St Ninian's Chapel, Mar Lodge Estate. Duke Connaught and Strathearn extinct. The diaries of Sir Alan Lascelles (age 56), King George VI's (age 47) private secretary, published in 2006, recorded that both the regiment and Athlone had rejected him as incompetent, and he fell out of a window when drunk and perished of hypothermia overnight.
Paternal Family Tree: Wettin
Maternal Family Tree: Anna Schaunberg 1370-1396
Kings Wessex: Great x 25 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 22 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 28 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 23 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great Grand Son of Queen Victoria of the United Kingdom
Kings Scotland: Great x 18 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 21 Grand Son of Louis VII King Franks
Kings France: Great x 16 Grand Son of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: Ernest Frederick Saxe Coburg Saalfeld Duke Saxe Coburg Saalfeld 1724-1800 12 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Francis Saxe Coburg Gotha I Duke Saxe Coburg Gotha 1750-1806 13 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Sophia Antonia Brunswick-Wolfenbüttel Duchess Saxe Coburg Saalfeld 1724-1802 15 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Ernest Saxe Coburg Gotha I Duke Saxe Coburg Gotha 14 x Great Grand Son of King Edward III of England
Great x 1 Grandfather: Prince Albert Saxe Coburg Gotha 15 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Duke Ernest of Saxe Coburg Altenburg 1745-1804 13 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Duke Augustus of Saxe Coburg Altenburg 1772-1822 14 x Great Grand Son of King Edward III of England
Great x 2 Grandmother: Duchess Louise Dorothea of Saxe Coburg Altenburg 1800-1831 15 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Grand Duke Frederick Francis I of Mecklenburg-Schwerin 13 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Louise Charlotte Mecklenburg-Schwerin 14 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Princess Louise of Saxe-Gotha-Altenburg 13 x Great Grand Daughter of King Edward III of England
GrandFather: Prince Arthur Windsor 1st Duke Connaught and Strathearn Son of Queen Victoria of the United Kingdom
Great x 4 Grandfather: Frederick Louis Hanover Prince of Wales
Son of King George II of Great Britain and Ireland
Great x 3 Grandfather: King George III of Great Britain and Ireland Grand Son of King George II of Great Britain and Ireland
Great x 4 Grandmother: Augusta Saxe Coburg Altenburg 12 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Edward Augustus Hanover 1st Duke Kent and Strathearn Son of King George III of Great Britain and Ireland
Great x 4 Grandfather: Charles Louis Frederick Duke of Mecklenburg 14 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Charlotte Mecklenburg Strelitz Queen Consort England 15 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 1 Grandmother: Queen Victoria of the United Kingdom Grand Daughter of King George III of Great Britain and Ireland
Great x 4 Grandfather: Ernest Frederick Saxe Coburg Saalfeld Duke Saxe Coburg Saalfeld 1724-1800 12 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Francis Saxe Coburg Gotha I Duke Saxe Coburg Gotha 1750-1806 13 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Sophia Antonia Brunswick-Wolfenbüttel Duchess Saxe Coburg Saalfeld 1724-1802 15 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Marie Luise Victoria Saxe Coburg Gotha Duchess Kent and Strathearn 14 x Great Grand Daughter of King Edward III of England
Father: Prince Arthur of Connaught Grand Son of Queen Victoria of the United Kingdom
Great x 4 Grandfather: Frederick William II King Prussia 1744-1797 Great Grand Son of King George I of Great Britain and Ireland
Great x 3 Grandfather: Frederick William II King Prussia 1770-1840 2 x Great Grand Son of King George I of Great Britain and Ireland
Great x 4 Grandmother: Queen Frederica Louisa of Prussia 17 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandfather: Charles Hohenzollern 3 x Great Grand Son of King George I of Great Britain and Ireland
Great x 1 Grandfather: Frederick Charles Hohenzollern 4 x Great Grand Son of King George I of Great Britain and Ireland
Great x 2 Grandmother: Marie Saxe Weimar Eisenach
GrandMother: Luise Margarete Hohenzollern Duchess Connaught 1860-1917 5 x Great Grand Daughter of King George I of Great Britain and Ireland
Alastair Windsor 2nd Duke Connaught and Strathearn 1914-1943 Great Grand Son of Queen Victoria of the United Kingdom
Great x 4 Grandfather: William Duff 1st Earl Fife 1697-1763
Great x 3 Grandfather: Alexander Duff 3rd Earl Fife 1731-1811
Great x 2 Grandfather: Alexander Duff
Great x 1 Grandfather: James Duff 5th Earl Fife 1814-1879
GrandFather: Alexander Duff 1st Duke Fife Great Grand Son of King William IV of the United Kingdom
Great x 4 Grandfather: James Hay 15th Earl Erroll 1726-1778 11 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: William Hay 17th Earl Erroll 12 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: William Hay 18th Earl Erroll 1801-1846 13 x Great Grand Son of King Edward III of England
Great x 1 Grandmother: Agnes Georgiana Elizabeth Hay Countess Fife 1829-1869 Grand Daughter of King William IV of the United Kingdom
Great x 4 Grandfather: King George III of Great Britain and Ireland Grand Son of King George II of Great Britain and Ireland
Great x 3 Grandfather: King William IV of the United Kingdom Son of King George III of Great Britain and Ireland
Great x 2 Grandmother: Elizabeth Fitzclarence Countess Erroll 1801-1856 Daughter of King William IV of the United Kingdom
Great x 3 Grandmother: Dorothea Bland aka "Mrs Jordan"
Mother: Princess Alexandra Duff Duchess Fife 1891-1959 Grand Daughter of King Edward VII of the United Kingdom
Great x 4 Grandfather: Francis Saxe Coburg Gotha I Duke Saxe Coburg Gotha 1750-1806 13 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Ernest Saxe Coburg Gotha I Duke Saxe Coburg Gotha 14 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: Prince Albert Saxe Coburg Gotha 15 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Duke Augustus of Saxe Coburg Altenburg 1772-1822 14 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Duchess Louise Dorothea of Saxe Coburg Altenburg 1800-1831 15 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Louise Charlotte Mecklenburg-Schwerin 14 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: King Edward VII of the United Kingdom Son of Queen Victoria of the United Kingdom
Great x 4 Grandfather: King George III of Great Britain and Ireland Grand Son of King George II of Great Britain and Ireland
Great x 3 Grandfather: Edward Augustus Hanover 1st Duke Kent and Strathearn Son of King George III of Great Britain and Ireland
Great x 4 Grandmother: Charlotte Mecklenburg Strelitz Queen Consort England 15 x Great Grand Daughter of King Henry "Curtmantle" II of England
Great x 2 Grandmother: Queen Victoria of the United Kingdom Grand Daughter of King George III of Great Britain and Ireland
Great x 4 Grandfather: Francis Saxe Coburg Gotha I Duke Saxe Coburg Gotha 1750-1806 13 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Marie Luise Victoria Saxe Coburg Gotha Duchess Kent and Strathearn 14 x Great Grand Daughter of King Edward III of England
GrandMother: Louise Windsor Duchess Fife 1867-1931 Daughter of King Edward VII of the United Kingdom
Great x 4 Grandfather: Friedrich Karl Ludwig Oldenburg I Duke Schleswig-Holstein-Sonderburg-Beck 1757-1816 17 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandfather: Friedrich Wilhelm Glücksburg Duke Schleswig Holstein Sonderburg Glücksburg 1785-1831 18 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 2 Grandfather: King Christian IX of Denmark 1818-1906 2 x Great Grand Son of King George II of Great Britain and Ireland
Great x 4 Grandfather: Charles Hesse-Kassel Grand Son of King George II of Great Britain and Ireland
Great x 3 Grandmother: Louise Caroline Hesse-Kassel Duchess Schleswig Holstein Sonderburg Glücksburg 1789-1867 Great Grand Daughter of King George II of Great Britain and Ireland
Great x 4 Grandmother: Louise Oldenburg Grand Daughter of King George II of Great Britain and Ireland
Great x 1 Grandmother: Alexandra Glücksburg Queen Consort England 3 x Great Grand Daughter of King George II of Great Britain and Ireland
Great x 4 Grandfather: Frederick Hesse-Kassel Grand Son of King George II of Great Britain and Ireland
Great x 3 Grandfather: William Hesse-Kassel Great Grand Son of King George II of Great Britain and Ireland
Great x 2 Grandmother: Queen Louise Hesse-Kassel of Denmark 1817-1898 2 x Great Grand Daughter of King George II of Great Britain and Ireland
Great x 4 Grandfather: Prince Frederick Oldenburg 16 x Great Grand Son of King Henry "Curtmantle" II of England
Great x 3 Grandmother: Princess Charlotte of Denmark 14 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Duchess Sophia Frederica of Mecklenburg-Schwerin 13 x Great Grand Daughter of King Edward III of England
