Nicholas married Rosemond Roseman Rose Burrows on 7 Dec 1755 in St. Blazey, Cornwall, UK. Rosemond (daughter of Richard Burrows and Elizabeth Kendal) was born before 4 Jul 1727 in Lanivet, Cornwall, UK; died before 28 May 1810 in , St. Blazey, Cornwall, UK. [Group Sheet] [Family Chart]

1. Elizabeth Trevithick was born before 30 Dec 1759 in St. Austell, Cornwall, UK.
2. Elener Trevithick was born before 26 Dec 1762 in St. Blazey, Cornwall, UK.
3. Mary Trevithick was born before 14 Apr 1765 in St. Blazey, Cornwall, UK.
4. Nicholas Trevithick was born before 27 Mar 1768 in St. Blazey, Cornwall, UK; died before 15 Oct 1835 in Tregrehan Mills, St. Blazey, Cornwall, UK; was buried on 15 Oct 1835 in St. Blazey, Cornwall, UK.
5. Thomas Trevithick was born before 6 Oct 1771 in St. Blazey, Cornwall, UK.

Thomas married Blanche - married Thomas Trevithick -. Blanche was born about 1695. [Group Sheet] [Family Chart]