David Alden (played by Terry Kinney) is Thomas Alden's brother. Having completed degrees in aerospace engineering and literature, he moved to his brother's farm after Aliane's funeral to help Thomas catch up with his work. David Alden is quite a comedian and brought humour to the tense situation. He studied Canada geese's migratory patterns.and greatly contributed to the elaboration of the ultralight aircraft prototypes used in the migration project. Alden is a personal friend of Doctor Killian, the North Carolina ornithologist who suggested a local wetland for the geese to winter in.
It was David Alden's idea to name Amy's limping gosling Igor after the Frankenstein character. When Igor got accidentally hit by Amy's ultralight during an excursion and the other geese confiscated, David took upon himself to distract the Animal Regulation officer with a tall tale so Barry Strickland could release the caged birds. He also came up with a far-fetched camping story when a border guard questioned him about the equipment he was carrying to the United States for the trip.
Probably as a joke and in order to scare officer Glen Seifert away, Amy once said that her uncle David had a black belt and was nicknamed "Killer."