+---John Wardlow Stevens
| +---Marianne Campbell 
+---George Frederick Stevens
| | +---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
| +---Jane Riddle (08 NOV 1860-)
| | +---William Chrichton
| +---Janet Chrichton (ABT 1840-16 DEC 1875)
James Porteous Stevens (08 MAR 1912-09 JUL 1974)
| +---Robert Porteous
| +---James Bowie Porteous (07 JUN 1842-16 JAN 1923)
| | +---Jane Bowie
+---Eveline Margaret Porteous (1889-1975)
| +---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
+---Janet (Jessie) Riddle (09 SEP 1864-1945)
| +---William Chrichton
+---Janet Chrichton (ABT 1840-16 DEC 1875)