On 20 Jun 1812 [his father] Henry Fitzroy 5th Duke Grafton (age 22) and [his mother] Mary Caroline Berkeley Duchess Grafton 1795-1873 (age 17) were married at Lisbon. He the son of George Henry Fitzroy 4th Duke Grafton (age 52) and Charlotte Maria Waldegrave. He a great x 3 grandson of King James II of England Scotland and Ireland. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland. 
On 05 Aug 1819 William Henry Fitzroy 6th Duke Grafton was born to Henry Fitzroy 5th Duke Grafton (age 29) and Mary Caroline Berkeley Duchess Grafton 1795-1873 (age 24).
On 28 Sep 1844 [his grandfather] George Henry Fitzroy 4th Duke Grafton (age 84) died. His son [his father] Henry Fitzroy 5th Duke Grafton (age 54) succeeded 5th Duke Grafton, 5th Earl Euston, 5th Viscount Ipswich, 5th Baron Sudbury, 6th Earl Arlington, 6th Viscount Thetford, 6th Baron Arlington of Arlington in Middlesex and 6th Baron Arlington of Arlington in Middlesex. [his mother] Mary Caroline Berkeley Duchess Grafton 1795-1873 (age 49) by marriage Duchess Grafton.
On 10 Feb 1858 William Henry Fitzroy 6th Duke Grafton (age 38) and Marie Anne Louise Baring Duchess Grafton 1833-1928 (age 25) were married. He the son of Henry Fitzroy 5th Duke Grafton (age 68) and Mary Caroline Berkeley Duchess Grafton 1795-1873 (age 62). He a great x 4 grandson of King James II of England Scotland and Ireland.
On 26 Mar 1863 [his father] Henry Fitzroy 5th Duke Grafton (age 73) died at Wakefield Lodge, Pottersbury. His son William Henry Fitzroy 6th Duke Grafton (age 43) succeeded 6th Duke Grafton, 6th Earl Euston, 6th Viscount Ipswich, 6th Baron Sudbury, 7th Earl Arlington, 7th Viscount Thetford, 7th Baron Arlington of Arlington in Middlesex and 7th Baron Arlington of Arlington in Middlesex. [his wife] Marie Anne Louise Baring Duchess Grafton 1833-1928 (age 30) by marriage Duchess Grafton.
On 05 Jan 1864 [his brother-in-law] Alexander Hugh Baring 4th Baron Ashburton (age 28) and Leonara Caroline Digby Baroness Ashburton (age 19) were married.
On 06 Sep 1868 [his father-in-law] Francis Baring 3rd Baron Ashburton (age 68) died. His son [his brother-in-law] Alexander Hugh Baring 4th Baron Ashburton (age 33) succeeded 4th Baron Ashburton of Ashburton in Devon. Leonara Caroline Digby Baroness Ashburton (age 23) by marriage Baroness Ashburton of Ashburton in Devon.
On 10 Sep 1873 [his mother] Mary Caroline Berkeley Duchess Grafton 1795-1873 (age 78) died.
On 21 May 1882 William Henry Fitzroy 6th Duke Grafton (age 62) died. His brother [his brother] Augustus Charles Lennox Fitzroy 7th Duke Grafton 1821-1918 (age 60) succeeded 7th Duke Grafton, 7th Earl Euston, 7th Viscount Ipswich, 7th Baron Sudbury, 8th Earl Arlington, 8th Viscount Thetford, 8th Baron Arlington of Arlington in Middlesex and 8th Baron Arlington of Arlington in Middlesex.
On 09 Apr 1928 [his former wife] Marie Anne Louise Baring Duchess Grafton 1833-1928 (age 95) died.
Paternal Family Tree: Stewart
Maternal Family Tree: Maria Susanne Luise von Degenfeld 1634-1677
Kings Wessex: Great x 23 Grand Son of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 20 Grand Son of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 26 Grand Son of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 21 Grand Son of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 4 Grand Son of King James II of England Scotland and Ireland
Kings Scotland: Great x 16 Grand Son of Robert "The Bruce" I King Scotland
Kings Franks: Great x 19 Grand Son of Louis VII King Franks
Kings France: Great x 6 Grand Son of Henry IV King France
Great x 4 Grandfather: Henry Fitzroy 1st Duke Grafton Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Charles Fitzroy 2nd Duke Grafton Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Isabella Bennet Duchess Grafton 11 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Augustus Fitzroy Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Charles Somerset Marquess Worcester
10 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Henrietta Somerset Duchess Grafton 1690-1726 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Rebecca Child Marchioness Worcester
Great x 1 Grandfather: Augustus Henry Fitzroy 3rd Duke Grafton 2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 3 Grandfather: Colonel William Cosby
Great x 2 Grandmother: Elizabeth Cosby
GrandFather: George Henry Fitzroy 4th Duke Grafton 3 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Henry Liddell 3rd Baronet 10 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Thomas Liddell 11 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Catherine Bright
Great x 2 Grandfather: Henry Liddell 1st Baron Ravensworth 12 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: James Clavering of Greencroft
10 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Jane Clavering 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Jane Ellison
Great x 1 Grandmother: Anne Liddell Duchess Grafton 
13 x Great Grand Daughter of King Edward III of England
Father: Henry Fitzroy 5th Duke Grafton 3 x Great Grand Son of King James II of England Scotland and Ireland
Great x 4 Grandfather: Charles Waldegrave 3rd Baronet 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Henry Waldegrave 1st Baron Waldegrave Chewton Somerset 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Helen Englefield Lady Waldegrave 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: James Waldegrave 1st Earl Waldegrave Grand Son of King James II of England Scotland and Ireland
Great x 4 Grandfather: King James II of England Scotland and Ireland
Son of King Charles I of England, Scotland and Ireland
Great x 3 Grandmother: Henrietta Fitzjames Countess Newcastle Daughter of King James II of England Scotland and Ireland
Great x 4 Grandmother: Anne Hyde Queen Consort England
Great x 1 Grandfather: James Waldegrave 2nd Earl Waldegrave Great Grand Son of King James II of England Scotland and Ireland
Great x 4 Grandfather: John Webb 2nd Baronet 9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: John Webb 3rd Baronet 10 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Blomer Lady Webb 9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Mary Webb Countess Waldegrave 1695-1719 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John Belasyse 1st Baron Belasyse
8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Barbara Belasyse Lady Webb 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anne Paulett Baroness Belasyse
9 x Great Grand Daughter of King Edward III of England
GrandMother: Charlotte Maria Waldegrave 2 x Great Grand Daughter of King James II of England Scotland and Ireland
Great x 4 Grandfather: Colonel Robert Walpole
Great x 3 Grandfather: Robert Walpole 1st Earl Orford
Great x 2 Grandfather: Edward Walpole 12 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: John Short of Bybrook
Great x 3 Grandmother: Catherine Shorter 11 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Elizabeth Philipps 10 x Great Grand Daughter of King Edward III of England
Great x 1 Grandmother: Maria Walpole Duchess Gloucester and Edinburgh 13 x Great Grand Daughter of King Edward III of England
Great x 3 Grandfather: Hammond Clement Postmaster
Great x 2 Grandmother: Dorothy Clement
William Henry Fitzroy 6th Duke Grafton 1819-1882 4 x Great Grand Son of King James II of England Scotland and Ireland
Great x 4 Grandfather: George Berkeley 1st Earl Berkeley 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Charles Berkeley 2nd Earl Berkeley 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Massingberd Couness Berkeley
Great x 2 Grandfather: James Berkeley 3rd Earl Berkeley 1679-1736 9 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Baptist Noel 3rd Viscount Campden
Great x 3 Grandmother: Elizabeth Noel Countess Berkeley 1654-1719
Great x 4 Grandmother: Hester Wotton Viscountess Campden
Great x 1 Grandfather: Augustus Berkeley 4th Earl Berkeley 1715-1755 Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: King Charles II of England Scotland and Ireland Son of King Charles I of England, Scotland and Ireland
Great x 3 Grandfather: Charles Lennox 1st Duke Richmond Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Louise Kéroualle 1st Duchess Portsmouth
Great x 2 Grandmother: Louisa Lennox Countess Berkeley 1694-1716 Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Francis Brudenell
9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Anne Brudenell Duchess Richmond 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Savile
8 x Great Grand Daughter of King Edward III of England
GrandFather: George Cranfield Berkeley 2 x Great Grand Son of King Charles II of England Scotland and Ireland
Great x 2 Grandfather: Henry Drax
Great x 1 Grandmother: Elizabeth Drax Countess Berkeley and Nugent
Great x 3 Grandfather: Edward Ernle 3rd Baronet
Great x 2 Grandmother: Elizabeth Ernle
Mother: Mary Caroline Berkeley Duchess Grafton 1795-1873 3 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: King Charles II of England Scotland and Ireland Son of King Charles I of England, Scotland and Ireland
Great x 3 Grandfather: Charles Lennox 1st Duke Richmond Son of King Charles II of England Scotland and Ireland
Great x 4 Grandmother: Louise Kéroualle 1st Duchess Portsmouth
Great x 2 Grandfather: Charles Lennox 2nd Duke Richmond Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Francis Brudenell 9 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Anne Brudenell Duchess Richmond 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Frances Savile 8 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: George Lennox Great Grand Son of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: Henry Cadogan
Great x 3 Grandfather: William Cadogan 1st Earl Cadogan
Great x 4 Grandmother: Bridget Waller
Great x 2 Grandmother: Sarah Cadogan Duchess Richmond 1705-1751
GrandMother: Emily Charlotte Lennox 2 x Great Grand Daughter of King Charles II of England Scotland and Ireland
Great x 4 Grandfather: William Kerr 2nd Marquess Lothian 1661-1722 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: William Kerr 3rd Marquess Lothian 1690-1767 7 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Jean Campbell Marchioness Lothian 6 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 2 Grandfather: William Henry Kerr 4th Marquess Lothian 1710-1775 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 1 Grandmother: Louisa Kerr 4 x Great Grand Daughter of King James I of England and Ireland and VI of Scotland
Great x 4 Grandfather: John Darcy
10 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Robert Darcy 3rd Earl Holderness 1681-1721 11 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Bridget Sutton
13 x Great Grand Daughter of King Edward "Longshanks" I of England
Great x 2 Grandmother: Caroline Darcy Marchioness Lothian 3 x Great Grand Daughter of King James I of England and Ireland and VI of Scotland
Great x 3 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 4 Grandmother: Karoline von der Pfalz
Great Grand Daughter of King James I of England and Ireland and VI of Scotland