On 14 Aug 1762 [her father] John Stewart 7th Earl Galloway 1736-1806 (age 26) and Charlotte Mary Greville (age 17) were married. She the daughter of Francis Greville 1st Earl Brooke Warwick Castle 1st Earl Warwick (age 42) and Elizabeth Hamilton Countess Brooke Warwick Castle and Warwick (age 42). He the son of Alexander Stewart 6th Earl Galloway (age 68) and (age 53).
On 13 Jun 1764 [her father] John Stewart 7th Earl Galloway 1736-1806 (age 28) and [her mother] Anne Dashwood Countess Galloway 1743-1830 (age 21) were married. He the son of Alexander Stewart 6th Earl Galloway (age 70) and (age 55).
On 10 Apr 1767 Susan Stewart Duchess Marlborough was born to John Stewart 7th Earl Galloway 1736-1806 (age 31) and Anne Dashwood Countess Galloway 1743-1830 (age 24).
On 24 Sep 1773 [her grandfather] Alexander Stewart 6th Earl Galloway (age 79) died. His son [her father] John Stewart 7th Earl Galloway 1736-1806 (age 37) succeeded 7th Earl Galloway, 6th Baronet Stewart of Corsewall, 5th Baronet Stewart of Burray in Orkney. [her mother] Anne Dashwood Countess Galloway 1743-1830 (age 30) by marriage Countess Galloway.
On 15 Sep 1791 George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 25) and Susan Stewart Duchess Marlborough (age 24) were married. She the daughter of John Stewart 7th Earl Galloway 1736-1806 (age 55) and Anne Dashwood Countess Galloway 1743-1830 (age 48). He the son of George Spencer 4th Duke Marlborough (age 52) and Caroline Russell Duchess Marlborough 1743-1811 (age 48).
On 10 Mar 1792 Henry Agar 2nd Viscount Clifden (age 31) and [her sister-in-law] Caroline Spencer Viscountess Clifden (age 29) were married. She by marriage Viscountess Clifden of Gowran in County Kilkenny. She the daughter of George Spencer 4th Duke Marlborough (age 53) and Caroline Russell Duchess Marlborough 1743-1811 (age 49).
On 27 Dec 1793 [her son] George Spencer-Churchill 6th Duke Marlborough was born to [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 27) and Susan Stewart Duchess Marlborough (age 26).
On 03 Dec 1794 [her son] Charles Spencer-Churchill was born to [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 28) and Susan Stewart Duchess Marlborough (age 27).
In 1795 [her brother-in-law] Henry John Spencer-Churchill (age 25) died.
In 1796 [her son] George Henry Spencer-Churchill was born to [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 29) and Susan Stewart Duchess Marlborough (age 28).
In 1797 [her son] Henry John Spencer-Churchill was born to [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 30) and Susan Stewart Duchess Marlborough (age 29).
On 25 Nov 1800 [her brother-in-law] Francis Almeric Spencer 1st Baron Churchill (age 20) and Frances Fitzroy Baroness Churchill Wychwood (age 20) were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton (age 65) and Elizabeth Wrottesley Duchess Grafton 1745-1822 (age 55). He the son of George Spencer 4th Duke Marlborough (age 61) and Caroline Russell Duchess Marlborough 1743-1811 (age 57). They were second cousins. She a great x 3 granddaughter of King Charles II of England Scotland and Ireland. 
In 1802 [her sister-in-law] Charlotte Spencer-Churchill (age 33) died.
On 13 Nov 1806 [her father] John Stewart 7th Earl Galloway 1736-1806 (age 70) died. His son [her brother] George Stewart 8th Earl Galloway 1768-1834 (age 38) succeeded 8th Earl Galloway, 7th Baronet Stewart of Corsewall, 6th Baronet Stewart of Burray in Orkney. Jane Paget Countess Galloway 1774-1842 (age 32) by marriage Countess Galloway.
In 1812 [her sister-in-law] Elizabeth Spencer (age 48) died.
In 1813 [her sister-in-law] Caroline Spencer Viscountess Clifden (age 50) died at Blenheim Palace.
In 1815 [her brother-in-law] Francis Almeric Spencer 1st Baron Churchill (age 35) was created 1st Baron Churchill Wychwood in Oxfordshire. Frances Fitzroy Baroness Churchill Wychwood (age 34) by marriage Baroness Churchill Wychwood in Oxfordshire.
On 29 Jan 1817 [her father-in-law] George Spencer 4th Duke Marlborough (age 78) died. His son [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 50) succeeded 5th Duke Marlborough, 5th Marquess of Blandford, 5th Earl of Marlborough, 5th Baron Churchill of Sandridge in Hertfordshire, 7th Earl of Sunderland, 9th Baron Spencer Wormleighton. Susan Stewart Duchess Marlborough (age 49) by marriage Duchess Marlborough.
On 13 Jan 1819 [her son] George Spencer-Churchill 6th Duke Marlborough (age 25) and [her daughter-in-law] Jane Stewart Duchess Marlborough 1798-1844 (age 21) were married. She the daughter of George Stewart 8th Earl Galloway 1768-1834 (age 50) and Jane Paget Countess Galloway 1774-1842 (age 44). He the son of George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 52) and Susan Stewart Duchess Marlborough 1767-1841 (age 51). They were first cousins.
In 1827 [her son] Charles Spencer-Churchill (age 32) and [her daughter-in-law] Etheldred Bennett were married. He the son of George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 60) and Susan Stewart Duchess Marlborough 1767-1841 (age 59).
In 1828 [her son] George Henry Spencer-Churchill (age 32) died.
In 1829 [her sister-in-law] Amelia Spencer-Churchill (age 55) died.
On 08 Jan 1830 [her mother] Anne Dashwood Countess Galloway 1743-1830 (age 87) died.
On 05 Mar 1840 [her husband] George Spencer-Churchill 5th Duke Marlborough 1766-1840 (age 73) died. His son [her son] George Spencer-Churchill 6th Duke Marlborough (age 46) succeeded 6th Duke Marlborough, 6th Marquess of Blandford, 6th Earl of Marlborough, 6th Baron Churchill of Sandridge in Hertfordshire, 8th Earl of Sunderland, 10th Baron Spencer Wormleighton. [her daughter-in-law] Jane Stewart Duchess Marlborough 1798-1844 (age 42) by marriage Duchess Marlborough.
On 28 Apr 1840 [her son] Charles Spencer-Churchill (age 45) died.
On 02 Jun 1840 [her son] Henry John Spencer-Churchill (age 43) died.
On 02 Apr 1841 Susan Stewart Duchess Marlborough (age 73) died.
Paternal Family Tree: Stewart
Maternal Family Tree: Elizabeth Spencer Lady Dashwood 1716-1798
Kings Wessex: Great x 22 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 19 Grand Daughter of Owain "Great" King Gwynedd 1100-1170
Kings Seisyllwg: Great x 25 Grand Daughter of Hywel "Dda aka Good" King Seisyllwg King Deheubarth
Kings Powys: Great x 20 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 13 Grand Daughter of King Edward III of England
Kings Scotland: Great x 15 Grand Daughter of Robert "The Bruce" I King Scotland
Kings Franks: Great x 19 Grand Daughter of Louis VII King Franks
Kings France: Great x 15 Grand Daughter of Philip "The Fair" IV King France
Great x 4 Grandfather: Alexander Stewart 1st Earl Galloway 1580-1649
Great x 3 Grandfather: James Stewart 2nd Earl Galloway 1610-1671
Great x 2 Grandfather: Alexander Stewart 3rd Earl Galloway -1690
Great x 1 Grandfather: James Stewart 5th Earl Galloway 1670-1746 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: William Douglas 1st Earl Queensberry 1582-1640 7 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: James Douglas 2nd Earl Queensberry 1622-1671 8 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Isabel Kerr Countess Queensberry 13 x Great Grand Daughter of King John "Lackland" of England
Great x 2 Grandmother: Mary Douglas Countess Galloway 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: John Stewart 1st Earl Traquair 1600-1659 7 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Margaret Stewart Countess Queensberry 8 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Catherine Carnegie Countess Traquair 1600-1655
GrandFather: Alexander Stewart 6th Earl Galloway 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Hugh Montgomerie 7th Earl Eglinton 1613-1669 8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Alexander Montgomerie 8th Earl Eglinton 1638-1701 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Mary Leslie Countess of Eglinton 1618-1661
8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Alexander Montgomerie 9th Earl Eglinton 10 x Great Grand Son of King Edward III of England
Great x 1 Grandmother: Catherine Montgomerie Countess Galloway 11 x Great Grand Daughter of King Edward III of England
Father: John Stewart 7th Earl Galloway 1736-1806 12 x Great Grand Son of King Edward III of England
Great x 2 Grandfather: 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: John Kennedy 6th Earl Cassilis -1668 8 x Great Grand Son of King Edward III of England
Great x 3 Grandmother: Catherine Kennedy 9 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Jean Hamilton Countess Cassilis
Great x 1 Grandfather: 11 x Great Grand Son of King Edward III of England
GrandMother: 12 x Great Grand Daughter of King Edward III of England
Susan Stewart Duchess Marlborough 1767-1841 13 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Samuel Dashwood
Great x 3 Grandfather: George Dashwood
Great x 2 Grandfather: Robert Dashwood 1st Baronet
Great x 4 Grandfather: William Perry
Great x 3 Grandmother: Margaret Perry
Great x 1 Grandfather: Robert Dashwood
Great x 4 Grandfather: Thomas Chamberlayne 1st Baronet
Great x 3 Grandfather: Thomas Chamberlayne 2nd Baronet
Great x 2 Grandmother: Penelope Chamberlayne Lady Dashwood
GrandFather: James Dashwood 2nd Baronet
Great x 4 Grandfather: Thomas Reade
Great x 3 Grandfather: John Reade 1st Baronet
Great x 2 Grandfather: James Reade 2nd Baronet
Great x 4 Grandfather: Thomas Style 1st Baronet
Great x 3 Grandmother: Susanna Style Lady Reade
Great x 1 Grandmother: Dorothy Reade
Great x 3 Grandfather: Robert Dring of Isleworth, Middlesex
Great x 2 Grandmother: Love Dring Lady Reade
Mother: Anne Dashwood Countess Galloway 1743-1830
Great x 4 Grandfather: Robert Spencer
Great x 3 Grandfather: Edward Spencer
Great x 2 Grandfather: John Spencer
Great x 1 Grandfather: Edward Spencer
GrandMother: Elizabeth Spencer Lady Dashwood