Family: Thomas Trevithick / Elizabeth Mary Coom (F642)
m. 8 Feb 1794Nicholas Trevithick (1722- ) 
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Rosemond Roseman Rose Burrows (1727-1810)
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| Elizabeth Trevithick (1759- ) |
| Elener Trevithick (1762- ) |
| Mary Trevithick (1765- ) |
Nicholas Trevithick (1768-1835)  |
| Walter Coom (1746- ) |
| Joan Searle (1746- ) |
| Jane Coom (1769- ) |
| Richard Coom (1770- ) |
| Walter Coom (1776- ) |
 | Mary Coom (1779- ) |
| John Coom (1782- ) |
| Thomas Trevithick (1771- )
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| Elizabeth Mary Coom (1773-1837)
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 | Mary Trevithick (1794- ) |
| Elizabeth Trevithick (1799- ) |
| Jane Trevithick (1801- ) |
| Blanche Trevithick (1806-1810) |
| Nicholas Trevithick (1810-1860) |
| Anne Trevithick (1813- ) |