On 29 Jun 1744 [his father] John Fitzpatrick 1st Earl Upper Ossory (age 25) and [his mother] Evelyn Leveson-Gower Countess Upper Ossory (age 19) were married. She by marriage Baroness Gowran of Bowran in County Kilkenny. She the daughter of John Leveson-Gower 1st Earl Gower (age 49) and Evelyn Pierrepont Baroness Gower.

On 29 Jan 1756 Augustus Henry Fitzroy 3rd Duke Grafton (age 20) and [his future wife] Anne Liddell Duchess Grafton (age 19) were married. He a great x 2 grandson of King Charles II of England Scotland and Ireland.

Before Aug 1760 [his step-father] Richard Vernon (age 34) and [his mother] Evelyn Leveson-Gower Countess Upper Ossory (age 35) were married. She the daughter of John Leveson-Gower 1st Earl Gower and Evelyn Pierrepont Baroness Gower.

On 23 Mar 1769 Augustus Henry Fitzroy 3rd Duke Grafton (age 33) and [his future wife] Anne Liddell Duchess Grafton (age 32) were divorced when he discovered she was pregnant by her lover John Fitzpatrick 2nd Earl Upper Ossory (age 23) whom she subsequently married. Plans to marry his mistress Anne aka Nancy Parsons Viscountess Maynard (age 34), if they existed, were undermined by the the discovery he discovered she was having an affair with John Frederick Sackville 3rd Duke Dorset (age 23).

After 23 Mar 1769 John Fitzpatrick 2nd Earl Upper Ossory (age 23) and Anne Liddell Duchess Grafton (age 32) were married. She by marriage Countess Upper Ossory. He the son of John Fitzpatrick 1st Earl Upper Ossory and Evelyn Leveson-Gower Countess Upper Ossory.

On 04 Jun 1778 John Smyth (age 30) and [his step-daughter] Georgiana Fitzroy (age 21) were married. She the daughter of Augustus Henry Fitzroy 3rd Duke Grafton (age 42) and Anne Liddell Duchess Grafton (age 41). She a great x 3 granddaughter of King Charles II of England Scotland and Ireland.

On 16 Nov 1784 [his step-son] George Henry Fitzroy 4th Duke Grafton (age 24) and Charlotte Maria Waldegrave (age 23) were married at Navestock. She the daughter of James Waldegrave 2nd Earl Waldegrave and Maria Walpole Duchess Gloucester and Edinburgh (age 48). He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 49) and Anne Liddell Duchess Grafton (age 47). He a great x 3 grandson of King Charles II of England Scotland and Ireland. She a great x 2 granddaughter of King James II of England Scotland and Ireland.

On 20 Jun 1795 [his step-son] Charles Fitzroy (age 30) and Frances Mundy were married. He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 59) and Anne Liddell Duchess Grafton (age 58). He a great x 3 grandson of King Charles II of England Scotland and Ireland.

Before 09 Feb 1810 [his former step-son] Charles Fitzroy (age 45) and Frances Stewart (age 32) were married. She the daughter of Robert Stewart 1st Marquess Londonderry (age 70) and Frances Pratt Marchioness Londonderry (age 59). He the son of Augustus Henry Fitzroy 3rd Duke Grafton (age 74) and Anne Liddell Duchess Grafton. He a great x 3 grandson of King Charles II of England Scotland and Ireland.