Stargate Atlantis: Genealogy is a short story, which was published by Titan Magazines in Stargate SG-1/Atlantis: The Official Magazine 22.
Summary
After a major concussion, Sheppard is taken off active duty. With time to kill, he decides to touch base with his ancestors...
Chronological Placement
This short story took place just after the Fandemonium novel called Stargate Atlantis: Mirror Mirror and is also set during Season 2 of Stargate Atlantis.