(-30 NOV 1970)
+---Mervyn Alexander
| | +---William Nicolson
| | +---John Nicolson
| | | +---Margaret Nicolson 
| | +---William Nicolson (01 OCT 1696-1781)
| | | +---Joanna Coke
| | +---Joseph Nicolson (20 AUG 1735-)
| | | +---Elizabeth Trosse
| | +---William Nicolson (30 JUL 1774-)
| | | +---Mary Dunsford
| | +---William Nicolson (14 AUG 1805-)
| | | +---Sarah Hewett
| | +---William (Patrick) Nicolson (10 FEB 1835-28 JUL 1898)
| | | | +---William Nicolson
| | | | +---John Nicolson
| | | | | +---Margaret Nicolson
| | | | +---William Nicolson (01 OCT 1696-1781)
| | | | | +---Joanna Coke
| | | | +---Joseph Nicolson (20 AUG 1735-)
| | | | | +---Elizabeth Trosse
| | | | +---Thomas Nicolson (01 JUL 1773-)
| | | | | +---Mary Dunsford
| | | +---Martha Nicolson (20 DEC 1803-)
| | | +---Esther Birt
| | +---Charles Ebenezer William Thurston G Nicolson (14 FEB 1867-26 JUN 1954)
| | | | +---William Cowley
| | | +---Ellen Cowley (26 SEP 1826-12 SEP 1913)
| +---Dorothy Ellen Nicolson (04 APR 1904-)
| +---Isabella Dawson (20 JAN 1877-08 JAN 1946)
? Alexander
+---Rachel ?