Before 16 Sep 1884 [his father] Sidney Francis Godolphin Osborne (age 49) and [his mother] Margaret Dulcibella Hammersley (age 23) were married. The difference in their ages was 25 years.
On 16 Sep 1884 Francis D'Arcy Godolphin Osborne 12th Duke of Leeds was born to Sidney Francis Godolphin Osborne (age 49) and Margaret Dulcibella Hammersley (age 23).
On 22 Oct 1903 [his father] Sidney Francis Godolphin Osborne (age 68) died.
On 23 Mar 1922 [his mother] Margaret Dulcibella Hammersley (age 61) died.
On 26 Jul 1963 John Francis Godolphin Osborne 11th Duke Leeds 1901-1963 (age 62) died without male issue. His second cousin once removed Francis D'Arcy Godolphin Osborne 12th Duke of Leeds (age 78) succeeded 12th Duke Leeds, 12th Earl of Danby, 12th Viscount Osborne, 12th Viscount Latimer, 12th Baron Osborne of Kinderton, 13th Baronet Osborne of Kiveton, 6th Baron Godolphin of Farnham Royal in Buckinghamshire.
On 20 Mar 1964 Francis D'Arcy Godolphin Osborne 12th Duke of Leeds (age 79) died unmarried without male issue. Duke Leeds, Earl of Danby, Viscount Osborne, Viscount Latimer, Baron Osborne of Kinderton, Baronet Osborne of Kiveton, Baron Darcy of Knayth, Baron Conyers, Baron Godolphin of Farnham Royal in Buckinghamshire extinct.
Paternal Family Tree: Osborne
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 27 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 x 8 Grand Son of King James I of England and Ireland and VI of Scotland
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 15 Grand Son of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: Peregrine Osborne 3rd Duke Leeds 11 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Thomas Osborne 4th Duke Leeds 12 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: Francis Osborne 5th Duke Leeds 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Francis Godolphin 2nd Earl Godolphin
9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Mary Godolphin Duchess Leeds -1764 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Henrietta Churchill 2nd Duchess Marlborough
15 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 1 Grandfather: Francis Osborne 1st Baron Godolphin 5 x Great Grand Son of King James I of England and Ireland and VI of Scotland
Great x 4 Grandfather: Robert Darcy 3rd Earl Holderness 1681-1721
11 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Darcy 4th Earl Holderness 1718-1778 3 x Great Grand Son of King James I of England and Ireland and VI of Scotland
Great x 4 Grandmother: Frederica Schomberg Countess Holderness and Fitzwalter 2 x Great Grand Daughter of King James I of England and Ireland and VI of Scotland
Great x 2 Grandmother: Amelia Darcy 12th Baroness Darcy 9th Baroness Conyers 4 x Great Grand Daughter of King James I of England and Ireland and VI of Scotland
GrandFather: Sidney Godolphin Osborne 6 x Great Grand Son of King James I of England and Ireland and VI of Scotland
Great x 4 Grandfather: John Eden 2nd Baronet
Great x 3 Grandfather: Robert Eden 3rd Baronet
Great x 4 Grandmother: Catherine Shafto
Great x 2 Grandfather: William Eden 1st Baron Auckland
Great x 1 Grandmother: Elizabeth Charlotte Eden Baroness Godolphin
Great x 4 Grandfather: Gilbert Elliot 2nd Baronet
Great x 3 Grandfather: Gilbert Elliot 3rd Baronet
Great x 4 Grandmother: Helen Steuart
Great x 2 Grandmother: Eleanor Elliot
Father: Sidney Francis Godolphin Osborne 7 x Great Grand Son of King James I of England and Ireland and VI of Scotland
Francis D'Arcy Godolphin Osborne 12th Duke of Leeds 1884-1964 8 x Great Grand Son of King James I of England and Ireland and VI of Scotland
Mother: Margaret Dulcibella Hammersley