Like her husband Francis II, who was devoted to his family and exhorted his heir in his last testament to "Preserve unity in the family and regard it as one of the highest goods," Caroline Augusta also was close to her relatives, especially her sister and niece who were also married into the imperial family. She was good friends with her half-sister, the Archduchess Sophie, who was married in 1824 to Caroline's step-son Archduke Franz Karl of Austria and would become the mother of two emperors, Franz Joseph of Austria-Hungary, and Maximilian of Mexico. She was also close to her half-niece, the Empress Elisabeth, who was Sophie's niece and daughter-in-law.