On 26 Mar 1758 [his father] John Fane 9th Earl of Westmoreland (age 29) and [his mother] Augusta Bertie (age 26) were married. He the son of Thomas Fane 8th Earl of Westmoreland (age 57) and Elizabeth Swymmer Countess Westmoreland.

On 28 May 1767 [his father] John Fane 9th Earl of Westmoreland (age 39) and [his step-mother] Susan Gordon Countess of Westmoreland (age 15) were married. The difference in their ages was 23 years. She the daughter of Cosmo George Gordon 3rd Duke Gordon and Catherine Gordon Duchess Gordon (age 49). He the son of Thomas Fane 8th Earl of Westmoreland (age 66) and Elizabeth Swymmer Countess Westmoreland.

On 20 May 1782 John Fane 10th Earl of Westmoreland (age 22) and Sarah Anne Child Countess of Westmoreland (age 17) were married at Gretna Green. She by marriage Countess of Westmoreland. He the son of John Fane 9th Earl of Westmoreland and Augusta Bertie.

In 1800 John Fane 10th Earl of Westmoreland (age 40) and Jane Huck Saunders Countess of Westmoreland (age 17) were married. The difference in their ages was 23 years. He the son of John Fane 9th Earl of Westmoreland and Augusta Bertie.

In 1804 [his son-in-law] John Parker 1st Earl Morley (age 31) and [his daughter] Augusta Fane Baroness Boringdon (age 18) were married. She by marriage Baroness Boringdon. She the daughter of John Fane 10th Earl of Westmoreland (age 44) and Sarah Anne Child Countess of Westmoreland.

On 23 May 1804 [his son-in-law] George Child-Villiers 5th Earl Jersey (age 30) and [his daughter] Sarah Sophia Fane Countess Jersey (age 19) were married at Berkeley Square, Mayfair. She the daughter of John Fane 10th Earl of Westmoreland (age 44) and Sarah Anne Child Countess of Westmoreland. He the son of George Bussy Villiers 4th Earl Jersey (age 68) and Frances Twysden (age 51).

On 16 Nov 1805 [his son-in-law] John Ponsonby 4th Earl Bessborough (age 24) and [his daughter] Maria Fane (age 18) were married at Berkeley Square, Mayfair. She the daughter of John Fane 10th Earl of Westmoreland (age 46) and Sarah Anne Child Countess of Westmoreland. He the son of Frederick Ponsonby 3rd Earl Bessborough (age 47) and Henrietta Frances Spencer Countess Bessborough (age 44).

In 1809 [his son-in-law] John Parker 1st Earl Morley (age 36) and [his daughter] Augusta Fane Baroness Boringdon (age 23) were divorced.

In 1809 [his son-in-law] Arthur Paget (age 37) and [his daughter] Augusta Fane Baroness Boringdon (age 23) were married. She the daughter of John Fane 10th Earl of Westmoreland (age 49) and Sarah Anne Child Countess of Westmoreland. He the son of Henry Bayly-Paget 1st Earl Uxbridge (age 64) and Jane Champagné Countess Uxbridge (age 67).

On 26 Jun 1811 [his son] John Fane 11th Earl of Westmoreland (age 27) and [his daughter-in-law] Priscilla Anne Wellesley-Pole Countess of Westmoreland (age 18) were married. She the daughter of William Wellesley aka Wellesley-Pole 3rd Earl Mornington (age 48) and Katherine Forbes Countess Mornington (age 50). He the son of John Fane 10th Earl of Westmoreland (age 52) and Sarah Anne Child Countess of Westmoreland.