| | | | Alexander Stewart
1699–1781 | |
| | | | | | | | |
| | | | Baron Londonderry (2nd creation), 1789
Viscount Castlereagh, 1795
Earl of Londonderry (3rd creation), 1796
Marquess of Londonderry, 1816 | |
Sarah Frances Seymour
1747–1770 | | Robert Stewart
1739–1821
1st Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry | | Frances Pratt
c. 1751–1833 | | | | |
| | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | Baron Stewart, 1814
Earl Vane and Viscount Seaham, 1823 | |
Robert Stewart
1769–1822
2nd Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry | | Catherine Bligh
d. 1812 | | Charles William Vane (né Stewart)
1778–1854
3rd Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
1st Earl Vane, Viscount Seaham, and Baron Stewart | | Frances Anne Vane
1800–1865 | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | Frederick William Robert Stewart
1805–1872
4th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry | | | | | | George Henry Robert Charles William Vane-Tempest
1821–1884
5th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
2nd Earl Vane, Viscount Seaham, and Baron Stewart | |
| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | Charles Stewart Vane-Tempest-Stewart
1852–1915
6th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
3rd Earl Vane, Viscount Seaham, and Baron Stewart | |
| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | Charles Stewart Henry Vane-Tempest-Stewart
1878–1949
7th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
4th Earl Vane, Viscount Seaham, and Baron Stewart | |
| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | Edward Charles Stewart Robert "Robin" Vane-Tempest-Stewart
1902–1955
8th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
5th Earl Vane, Viscount Seaham, and Baron Stewart | |
| | | | | | | | | | | | | | | | |
| | | | | | | | | | | | Alexander Charles Robert "Alastair" Vane-Tempest-Stewart
1937–2012
9th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
6th Earl Vane, Viscount Seaham, and Baron Stewart | |
| | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | Frederick Vane-Tempest-Stewart
b. 1972
10th Marquess of Londonderry, Earl of Londonderry, Viscount Castlereagh, and Baron Londonderry
7th Earl Vane, Viscount Seaham, and Baron Stewart | | Reginald Alexander Vane-Tempest-Stewart
b. 1977 | |
| | | | | | | | | | | | | | | | Heir presumptive to all titles | |
|
