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| | | | Baron Kerry, 1223 | |
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| | | | Earl of Kerry, 1753 | |
| | | | Thomas FitzMaurice
1668–1741
1st Earl of Kerry,
21st Baron Kerry | |
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| | | | | | | | | Viscount FitzMaurice and Baron Dunkeron, 1751
Earl of Shelburne (2nd creation), 1753
Baron Wycombe, 1760 | |
| | | | William FitzMaurice
1694–1747
2nd Earl of Kerry,
22nd Baron Kerry | | John Petty-Fitzmaurice
1706–1761
1st Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe | |
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| | | | | | | | | Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston, 1784 | |
| | | | Francis Thomas-Fitzmaurice
1740–1818
3rd Earl of Kerry,
23rd Baron Kerry | | William Petty-Fitzmaurice
1737–1805
1st Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
2nd Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe | | | | | | Baron Nairne | |
| | | | | | | | | | | | | Baron Keith (1st creation: Ireland), 1797
Baron Keith (2nd creation: UK), 1801
Baron Keith (3rd creation: UK), 1803
Viscount Keith (UK), 1814 | | | | | | |
| | | | | | | | John Henry Petty
1765–1809
2nd Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
3rd Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe | | George Keith Elphinstone
1746–1823
Viscount Keith, Baron Keith (Ire, UK, UK) | | Jane Mercer | | |
| | | | | | | | | | | | | Viscountcy Keith and Barony Keith (1st creation) extinct, 1801 | | | | |
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| | | | | | | | Henry Petty-Fitzmaurice
1780–1863
3rd Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
4th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe
4th Earl of Kerry, 24th Baron Kerry | | Margaret Mercer Elphinstone
1788–1867
Comtesse de Flahaut, 2nd Baroness Keith (Ire, UK), 7th Lady Nairne | |
| | | | | | | | | | | | | Baronies Keith (2nd & 3rd creations) extinct, 1867 | |
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| | | | | | | | Henry Thomas Petty-Fitzmaurice
1816–1866
4th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
5th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe
5th Earl of Kerry, 24th Baron Kerry | | Emily Jane Petty-FitzMaurice
1819–1895
8th Lady Nairne | | |
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Baron Mersey, 1910
Viscount Mersey, 1916 | | | | | | | | | | | | | | | Baron Fitzmaurice, 1906 | |
John Charles Bigham
1840–1929
1st Viscount Mersey | | | | | | Henry Charles Keith Petty-Fitzmaurice
1845–1927
5th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
6th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 6th Earl of Kerry, 24th Baron Kerry, 9th Lord Nairne | | | | | | Edmond Fitzmaurice
1846–1935
Baron Fitzmaurice | |
| | | | | | | | | | | | | | | | | | | Barony Fitzmaurice extinct, 1935 | | | | | |
Charles Clive Bigham
1872–1956
2nd Viscount Mersey | | | | | | Henry William Edmund Petty-Fitzmaurice
1872–1936
6th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
7th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 7th Earl of Kerry, 25th Baron Kerry, 10th Lord Nairne | | Charles Fitzmaurice
1874–1914 | |
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Edward Clive Bigham
1906–1979
3rd Viscount Mersey | | Katherine Bigham
1912–1995
11th Lady Nairne | | Charles Hope Petty-Fitzmaurice
1917–1944
7th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
8th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 8th Earl of Kerry, 26th Baron Kerry, 11th Lord Nairne | | George John Charles Mercer Nairne Petty-Fitzmaurice
1912–1999
8th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
9th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 9th Earl of Kerry, 27th Baron Kerry | | |
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Richard Maurice Clive Bigham
1934–2006
4th Viscount Mersey, 13th Lord Nairne | | David Edward Hugh Bigham
b. 1938
Heir apparent to the Viscountcy Mersey | | | | | | Charles Maurice Petty-Fitzmaurice
b. 1941
9th Marquess of Lansdowne, Earl of Wycombe, and Viscount Calne and Calston,
10th Earl of Shelburne, Viscount FitzMaurice, Baron Dunkeron, and Baron Wycombe, 10th Earl of Kerry, 28th Baron Kerry | |
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Edward John Hallam Bigham
b. 1966
5th Viscount Mersey, 14th Lord Nairne | | Charles Richard Petty Bigham
b. 1967
Heir apparent in the heir presumptive to the Viscountcy Mersey | | | | | | Simon Henry George Petty-Fitzmaurice
b. 1970
styled Earl of Kerry | |
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Flora Bigham, Mistress of Nairne
b. 2003
styled Mistress of Nairne | | | | | | | | | | George Henry Charles Petty-Fitzmaurice
b. 2020
styled Viscount Calne and Calston | |
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