On 04 Sep 1785 [his father] George Granville Leveson-Gower 1st Duke Sutherland (age 27) and [his mother] Elizabeth Sutherland Duchess Sutherland 19th Countess Sutherland (age 20) were married. He by marriage Earl Sutherland. She the daughter of William Sutherland 18th Earl Sutherland. He the son of Granville Leveson-Gower 1st Marquess Stafford (age 64) and Louisa Egerton Countess Gower.

On 07 Mar 1822 George James Welbore Agar 1st Baron Dover (age 25) and [his future sister-in-law] Georgiana Howard Lady Dover (age 18) were married. She the daughter of George Howard 6th Earl Carlisle (age 48) and Georgiana Cavendish Countess Carlisle (age 38). They were third cousins.

On 14 May 1823 William Lascelles (age 24) and [his future sister-in-law] Caroline Georgiana Howard (age 19) were married. She the daughter of George Howard 6th Earl Carlisle (age 49) and Georgiana Cavendish Countess Carlisle (age 39). He the son of Henry Lascelles 2nd Earl Harewood (age 55) and Henrietta Sebright Countess Harewood.

On 28 May 1823 George Sutherland Leveson-Gower 2nd Duke Sutherland (age 36) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 17) were married. She the daughter of George Howard 6th Earl Carlisle (age 49) and Georgiana Cavendish Countess Carlisle (age 39). He the son of George Granville Leveson-Gower 1st Duke Sutherland (age 65) and Elizabeth Sutherland Duchess Sutherland 19th Countess Sutherland (age 58). They were first cousin once removed.

On 12 Aug 1840 Francis Richard Grey (age 27) and [his sister-in-law] Elizabeth Dorothy Anne Howard (age 23) were married. She the daughter of George Howard 6th Earl Carlisle (age 66) and Georgiana Cavendish Countess Carlisle (age 57). He the son of Charles Grey 2nd Earl Grey (age 76) and Mary Elizabeth Ponsonby Countess Grey (age 64). They were third cousins.

In 1842 [his brother-in-law] Admiral Edward Howard 1st Baron Lanerton (age 32) and Diana Ponsonby Baroness Lanerton were married. He the son of George Howard 6th Earl Carlisle (age 68) and Georgiana Cavendish Countess Carlisle (age 58). They were third cousins.

On 19 Mar 1842 [his son] Albert Leveson-Gower and [his daughter-in-law] Grace Emma Abdy were married at St George's Church, Hanover Square. He the son of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 55) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 35).

On 08 Aug 1842 [his brother-in-law] Charles Wentworth George Howard (age 28) and Priscilla Harriet Parke were married. He the son of George Howard 6th Earl Carlisle (age 68) and Georgiana Cavendish Countess Carlisle (age 59).

In 1844 [his son-in-law] George Douglas Campbell 8th Duke Argyll (age 20) and [his daughter] Elizabeth Georgiana Leveson-Gower Duchess Argyll were married. She the daughter of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 57) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 37). He the son of John Douglas Edward Henry Campbell 7th Duke Argyll (age 66) and Joan Glassel.

In 1845 [his brother-in-law] Henry George Howard (age 26) and Mary Wellesley MacTavish (age 19) were married. He the son of George Howard 6th Earl Carlisle (age 71) and Georgiana Cavendish Countess Carlisle (age 61).

On 12 Oct 1847 [his son-in-law] Charles William Fitzgerald Fitzgerald 4th Duke Leinster (age 28) and [his daughter] Caroline Leveson-Gower Duchess Leinster (age 20) were married at Trentham, Staffordshire. She the daughter of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 61) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 41). He the son of Augustus Fitzgerald 3rd Duke Leinster (age 56) and Charlotte Augusta Stanhope Duchess Leinster (age 54). He a great x 4 grandson of King Charles II of England Scotland and Ireland.

On 27 Jun 1849 [his son] George Leveson-Gower 3rd Duke Sutherland (age 20) and [his daughter-in-law] Anne Hay Mackenzie Duchess Sutherland (age 20) were married. He the son of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 62) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 43).

In 1852 Henry Labouchere 1st Baron Taunton (age 53) and [his sister-in-law] Mary Matilda Georgiana Howard Baroness Taunton (age 28) were married. The difference in their ages was 24 years. She the daughter of George Howard 6th Earl Carlisle and Georgiana Cavendish Countess Carlisle (age 68).

On 28 Apr 1852 [his son-in-law] Hugh Lupus Grosvenor 1st Duke Westminster (age 26) and [his daughter] Constance Leveson-Gower Duchess Westminster (age 17) were married. Their first son Victor Alexander Grosvenor was born a year later to the day. She the daughter of George Sutherland Leveson-Gower 2nd Duke Sutherland (age 65) and Harriet Elizabeth Georgiana Howard Duchess Sutherland (age 45). He the son of Richard Grosvenor 2nd Marquess Westminster (age 57) and Elizabeth Mary Leveson-Gower Marchioness Westminster (age 55). They were first cousins.