William James Davidson 1910–1983 | | |
Ronald Davidson 1915–1983 | | |
Joseph Davidson 1922–1982 | | |
Norman Davidson 1924–1986 | | |
| | William James Davidson 1881– | | | | | | | | | Joseph Davidson 1800–1870 |
| | | Robert Blackett 1818–1874 Elizabeth Dalton 1830–1876 | | | | Margaret Collin or Tinckler (see note) 1792–1832 Margaret Dalton 1806–1880 | | | | Joseph Blackett 1742–1808 | | |
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| | | Elisabeth Pearson 1800–1862 |
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