| | | | Daniel MacMillan (1813–1857) |
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| | | | Maurice Crawford Macmillan (1853–1936) |
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| | | | Earl of Stockton and Viscount Macmillan of Ovenden, 1984) |
| | | | (Maurice) Harold Macmillan (1894–1986) 1st Earl of Stockton |
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| | | | Maurice Victor Macmillan (1921–1984) styled Viscount Macmillan of Ovenden |
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Alexander Daniel Alan Macmillan (b. 1943) 2nd Earl of Stockton, 2nd Viscount Macmillan of Ovenden | | Adam Julian Robert Macmillan (1948–2016) | | | | | | David Maurice Benjamin Macmillan (b. 1957) |
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Daniel Maurice Alan Macmillan (b. 1974) styled Viscount Macmillan of Ovenden | | Frederick Maurice Brian Macmillan (b. 1990) | | Joshua Gabriel P. Macmillan (b. 1995) | | Finn Joshua Marcus Macmillan (b. 1995) |
Heir apparent to the Earldom of Stockton |