On 01 May 1804 [her grandfather] Henry Cecil 1st Marquess Exeter (age 50) died. His son [her father] Brownlow Cecil 2nd Marquess Exeter 1795-1867 (age 8) succeeded 2nd Marquess Exeter, 11th Earl Exeter, 12th Baron Burghley.
On 12 May 1824 [her father] Brownlow Cecil 2nd Marquess Exeter 1795-1867 (age 28) and [her mother] Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 (age 21) were married. She by marriage Marchioness Exeter. He the son of Henry Cecil 1st Marquess Exeter and .
In 1832 Mary Frances Cecil Countess Harrowby Lincolnshire was born to Brownlow Cecil 2nd Marquess Exeter 1795-1867 (age 36) and Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 (age 28).
In Jul 1835 [her step-father] Horace Beauchamp Seymour-Conway (age 43) and [her mother] Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 (age 32) were married. They were third cousins. He a great x 3 grandson of King James II of England Scotland and Ireland. 
In 1861 Dudley Ryder 3rd Earl of Harrowby 1831-1900 (age 29) and Mary Frances Cecil Countess Harrowby Lincolnshire (age 29) were married. She the daughter of Brownlow Cecil 2nd Marquess Exeter 1795-1867 (age 65) and Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 (age 57). He the son of Dudley Ryder 2nd Earl of Harrowby 1798-1882 (age 62) and Frances Stuart Countess Harrowby Lincolnshire -1859.
On 16 Jan 1867 [her father] Brownlow Cecil 2nd Marquess Exeter 1795-1867 (age 71) died. His son [her brother] William Alleyne Cecil 3rd Marquess Exeter (age 41) succeeded 3rd Marquess Exeter, 12th Earl Exeter, 13th Baron Burghley.
He was buried at St Martin's Church, Stamford [Map].
On 06 Mar 1879 [her mother] Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 (age 76) died.
On 19 Nov 1882 [her father-in-law] Dudley Ryder 2nd Earl of Harrowby 1798-1882 (age 84) died. His son [her husband] Dudley Ryder 3rd Earl of Harrowby 1831-1900 (age 51) succeeded 3rd Earl of Harrowby. Mary Frances Cecil Countess Harrowby Lincolnshire (age 50) by marriage Countess of Harrowby.
On 26 Mar 1900 [her husband] Dudley Ryder 3rd Earl of Harrowby 1831-1900 (age 69) died. His brother [her brother-in-law] Henry Ryder 4th Earl of Harrowby 1836-1900 (age 63) succeeded 4th Earl of Harrowby.
In Jul 1917 Mary Frances Cecil Countess Harrowby Lincolnshire (age 85) died.
Paternal Family Tree: Cecil
Maternal Family Tree: Audrey Saunders 1551-1588
Kings Wessex: Great x 23 Grand Daughter of King Edmund "Ironside" I of England
Kings Gwynedd: Great x 20 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 21 Grand Daughter of Maredudd ap Bleddyn King Powys 1047-1132
Kings England: Great x 12 Grand Daughter of King Henry VII of England and Ireland
Kings Scotland: Great x 18 Grand Daughter of William "Lion" I King Scotland
Kings Franks: Great x 19 Grand Daughter of Louis VII King Franks
Kings France: Great x 15 Grand Daughter of Charles "Beloved Mad" VI King France
Great x 4 Grandfather: John Cecil 5th Earl Exeter 1648-1700 6 x Great Grand Son of King Henry VII of England and Ireland
Great x 3 Grandfather: John Cecil 6th Earl Exeter 7 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandmother: Anne Cavendish Countess Exeter
9 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Brownlow Cecil 8th Earl Exeter 1701-1754 8 x Great Grand Son of King Henry VII of England and Ireland
Great x 4 Grandfather: John Brownlow 3rd Baronet
Great x 3 Grandmother: Elizabeth Brownlow Countess Exeter 1681-1723
Great x 4 Grandmother: Alice Sherard Baroness Brownlow
Great x 1 Grandfather: Thomas Cecil 9 x Great Grand Son of King Henry VII of England and Ireland
GrandFather: Henry Cecil 1st Marquess Exeter 10 x Great Grand Son of King Henry VII of England and Ireland
Father: Brownlow Cecil 2nd Marquess Exeter 1795-1867 11 x Great Grand Son of King Henry VII of England and Ireland
Mary Frances Cecil Countess Harrowby Lincolnshire 1832-1917 12 x Great Grand Daughter of King Henry VII of England and Ireland
Great x 4 Grandfather: Newdigate Poyntz 11 x Great Grand Son of King Henry III of England
Great x 3 Grandfather: William Poyntz 12 x Great Grand Son of King Henry III of England
Great x 2 Grandfather: Stephen Poyntz 13 x Great Grand Son of King Henry III of England
Great x 1 Grandfather: William Poyntz 11 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: John Mordaunt 1st Viscount Mordaunt
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Lewis Mordaunt 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Carey Viscountess Mordaunt
8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandmother: Anna Maria Mordaunt 10 x Great Grand Daughter of King Edward III of England
GrandFather: William Stephen Poyntz 12 x Great Grand Son of King Edward III of England
Mother: Frances Isabella Selina Poyntz Marchioness of Exeter 1803-1879 13 x Great Grand Daughter of King Edward III of England
Great x 4 Grandfather: Francis Browne 3rd Viscount Montagu
8 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: Henry Browne 5th Viscount Montagu 9 x Great Grand Son of King Edward III of England
Great x 4 Grandmother: Elizabeth Somerset Viscountess Montague
8 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Anthony Browne 6th Viscount Montagu 10 x Great Grand Son of King Edward III of England
Great x 4 Grandfather: Thomas Walsingham
Great x 3 Grandmother: Barbara Walsingham Viscountess Montague 10 x Great Grand Daughter of King Edward III of England
Great x 4 Grandmother: Anne Howard
9 x Great Grand Daughter of King Edward III of England
Great x 1 Grandfather: Anthony Joseph Browne 7th Viscount Montagu 11 x Great Grand Son of King Edward III of England
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: Barbara Webb Viscountess Montague 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: Elizabeth Mary Browne 12 x Great Grand Daughter of King Edward III of England
Great x 2 Grandfather: Herbert Mackworth
Great x 1 Grandmother: Frances Falconer Mackworth Viscountess Montague 11 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Kildare Digby 2nd Baron Digby
9 x Great Grand Son of King Edward III of England
Great x 3 Grandfather: William Digby 5th Baron Digby 10 x Great Grand Son of King Edward III of England
Great x 2 Grandmother: Juliana Digby 10 x Great Grand Daughter of Henry IV King England
Great x 4 Grandfather: Edward Noel 1st Earl Gainsborough
Great x 3 Grandmother: Jane Noel Baroness Digby 9 x Great Grand Daughter of Henry IV King England
Great x 4 Grandmother: Elizabeth Wriothesley Countess Gainsborough
8 x Great Grand Daughter of Henry IV King England