Before 1762 [her father] Andrew Archer 2nd Baron Archer (age 25) and [her mother] Sarah West Baroness Archer were married.

On 30 Mar 1776 Gore Townsend (age 23) and [her future sister-in-law] Elizabeth Windsor (age 19) were married. She the daughter of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 39).

In 1778 Other Windsor 5th Earl Plymouth (age 26) and Sarah Archer Countess Plymouth and Amherst (age 16) were married. She by marriage Countess Plymouth. He the son of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 41). They were first cousins.

In 1785 James Long aka Tylney-Long 7th Baronet (age 49) and [her sister-in-law] Catherine Sydney Windsor (age 30) were married. She the daughter of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 48). They were third cousin once removed.

On 04 Aug 1786 William Champion de Crespigny 2nd Baronet (age 21) and [her sister-in-law] Sarah Windsor Lady Champion de Crespigny (age 23) were married. She the daughter of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 50).

On 06 Jun 1787 Thomas Broughton 6th Baronet (age 42) and [her sister-in-law] Anne Windsor Lady Broughton (age 26) were married. She by marriage Lady Broughton of Broughton in Staffordshire. She the daughter of Other Lewis Windsor 4th Earl Plymouth and Catherine Archer Countess Plymouth (age 50).

In 1799 John Hale (age 34) and [her future sister-in-law] Elizabeth Amherst (age 25) were married.

In 1800 William Pitt Amherst 1st Earl Amherst (age 26) and Sarah Archer Countess Plymouth and Amherst (age 38) were married.

In 1811 [her son-in-law] Arthur Blundell Sandys Trumbull Hill 3rd Marquess Downshire (age 22) and [her daughter] Maria Windsor Marchioness Downshire (age 21) were married. She by marriage Marchioness Downshire. She the daughter of Other Windsor 5th Earl Plymouth and Sarah Archer Countess Plymouth and Amherst (age 49). He the son of Arthur Hill 2nd Marquess Downshire and Mary Sandys Marchioness Downshire (age 46). They were half third cousins.

On 05 Aug 1811 [her son] Other Archer Windsor 6th Earl Plymouth (age 22) and [her daughter-in-law] Mary Sackville Countess Plymouth Amherst (age 19) were married. She by marriage Countess Plymouth. She the daughter of John Frederick Sackville 3rd Duke Dorset and Arabella Diana Cope 3rd Duchess Dorset (age 42). He the son of Other Windsor 5th Earl Plymouth and Sarah Archer Countess Plymouth and Amherst (age 49).

In 1819 [her son-in-law] Robert Henry Herbert (age 29) and [her daughter] Harriet Windsor (age 21) were married. She the daughter of Other Windsor 5th Earl Plymouth and Sarah Archer Countess Plymouth and Amherst (age 57). He the son of Edward Clive 1st Earl Powis (age 64) and Henrietta Antonia Herbert 3rd Countess Powis (age 60). He a great x 4 grandson of King James II of England Scotland and Ireland.

In 1834 [her son] William Amherst 2nd Earl Amherst (age 28) and [her daughter-in-law] Gertrude Percy Countess Amherst (age 19) were married. She the daughter of Bishop Hugh Percy (age 49) and Mary Manners Sutton. He the son of William Pitt Amherst 1st Earl Amherst (age 60) and Sarah Archer Countess Plymouth and Amherst (age 72). They were third cousin once removed.

In 1839 [her former husband] William Pitt Amherst 1st Earl Amherst (age 65) and [her former daughter-in-law] Mary Sackville Countess Plymouth Amherst (age 46) were married. She by marriage Countess Amherst. She the daughter of John Frederick Sackville 3rd Duke Dorset and Arabella Diana Cope 3rd Duchess Dorset.