Donald's twin sister and mother of Huey, Dewey, and Louie. After ten years of unexplained absence, she reunites with her family following her escape from the Moon and adjusts to motherhood while unaware of the Moonlanders' impending invasion.
Their relationship spans years of absence, culminating in direct interaction and shared leadership.
After years apart, they restore sibling trust and collaborate on family protection.
Della's return catalyzes Donald's transition from distant brother to coordinated ally.
Forged in isolation, their alliance operationalizes as coordinated support for family missions.
Sibling rivalry and distance gradually transform into coordinated teamwork.
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