Baron Georg von Trapp, patriarch of the von Trapp family, is a retired naval captain from the Austro-Hungarian Navy whose military background informs his disciplined household management. After his first wife Agatha's death, he raises their seven children—Rupert, Hedwig, Werner, Maria, Johanna, Martina, and Agathe—while grief shapes his initial reserve and structured parenting.

He hires Maria Kutschera as governess solely to tutor his daughter Maria during her illness recovery. Maria's presence gradually introduces warmth and music into the home, softening the Baron's stern demeanor and fostering deeper bonds with his children. Their respectful relationship evolves into marriage, expanding the family with additional children including Johannes.

The Baron directs household staff like butler Hans, housekeeper Baroness Matilda—an aristocrat assisting post-Agatha—gardener Franz, and cook Rosy. Hans's growing allegiance to Germany strains relations amid political shifts.

Financial pressures prompt the Baron to allow the family's musical talents, guided by Lotte Lehmann and Reverend Franz Wasner, to transition from private enjoyment to public performances at events like the Salzburg Festival.

Facing Austria's political turmoil, he rejects Nazi Germany's military reinstatement offer, opposing their ideology. This defiance forces the family to flee Austria. They escape to Italy with aid from Karl, former maid Mimi's boyfriend, avoiding a mountain crossing as Nazi pressure intensifies under officials including a Gestapo officer resembling Reinhard Heydrich.

Their flight and resettlement highlight the Baron's prioritization of family safety over wealth or status. His journey transforms from disciplined naval officer and grieving widower to a protective father upholding moral integrity during upheaval, ultimately leading his family to a new life beyond Austria.