Renown Australian journalist and author Geraldine Brooks has tried for four years to secure her adopted son, Bizu, an Australian citizenship.

Bizu was adopted by Geraldine and her late husband Tony when they lived in the US.

The complex case has raised the question of what it means to be an Australian citizen.

Guests: Geraldine Brooks

Bizu Brooks Horwitz

Professor Kim Rubenstein, University of Canberra