John and Oread Drummond's children were:
- William Drummond, grandfather of Bulldog Drummond and Korak
- Colina Drummond, mother of Richard Hannay
- Nyad Drummond, grandmother of Jongor
The Drummonds' grandchildren and great-children were all distinguished persons, having inherited the genetic benefit of the Wold Newton Meteorite's ionizing radiation upon John Drummond's father and mother.