+---Dennys Sandercock
| | +---Thomas Martyn (BEF 1674-)
| | +---Philip Martyn (1702-)
| | | +---Mary Congdon 
| | +---Robert Martyn (1733-)
| | | +---Elizabeth ?
| | +---Philip Martyn (1766-)
| | | +---Elizabeth Webb
| | +---Robert Martyn (1798-)
| | | +---Mary Ann Warwick
| | +---John Martyn (19 FEB 1826-30 MAR 1893)
| | | +---Elizabeth Nicholls (1791-)
| | +---Joseph Martyn (ABT 1858-)
| | | +---Fanny Grigg (ABT 1827-)
| +---Polly Martyn (1891-)
| +---Ellen Martin (ABT 1860-)
Stephen Sandercock
+---Frances Sandercumbe