+---Herbert Thomas James Signal (23 OCT 1914-)
| +---Mary Elizabeth Shaw 
+---Herbert Alan Signal (16 MAY 1949-)
| | +---James Riddell (14 NOV 1804-15 FEB 1892)
| | +---Walter Riddle (ABT AUG 1835-30 MAY 1914)
| | | | +---Andrew Goodall (-BEF 1869)
| | | +---Jane Goodall (ABT 1805-09 AUG 1869)
| | | +---Janet Donaldson
| | +---Stevens (Steve) Riddle (01 JAN 1878-)
| | | | +---Andrew Stevens
| | | +---Marian Campbell Stevens (04 JUN 1852-16 AUG 1922)
| | | +---Marianne Campbell
| +---Madge Riddle (1916-)
| | +---John Bowman
| | +---Constantine Bowman (ABT 1829-16 SEP 1909)
| | +---William Bowman (02 DEC 1857-)
| | | | +---John Popham
| | | +---Ann Popham (ABT 1830-22 JUN 1861)
| +---Annie Bowman (1896-)
| +---Margaret Muir Fitzgerald (03 NOV 1859-)
Mark Clayton Signal (03 OCT 1973-)
+---Patrice Glenn Fergusson