1876–1955♂ Frederick Parker Birkett | | |
| | 1849–1933♂ Thomas Parker Birkett 1852–1947♀ Annie Elizabeth Rodman | | | | 1813–1880♂ Thomas Parker Birkett 1820–1914♀ Sarah B. Roydhouse | | | | 1785–1851♂ John Roydhouse 1798–1846♀ Francis Parkinson | | | | 1752–1792♂ Matthew Roydhouse 1756–1796♀ Rebecca Richardson |
| | | 1776–1844♂ Francis Parkinson 1777–1868♀ Margaret Sharp | | |
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