Paddington's aunt who lives at a home for retired bears in Peru is Aunt Lucy.
Aunt Lucy is one of the most important figures in Paddington's backstory. She helps raise him in Peru and later moves to a home for retired bears. Before Paddington travels to Britain, she encourages him to seek a new life there, making her a major reason for his journey.
In the books, Paddington keeps in contact with Aunt Lucy through letters. These communications connect his new life with his South American past and allow him to share news about the Brown family and his adventures. Aunt Lucy's influence also helps explain Paddington's good manners and his sense that family responsibilities matter.
Aunt Lucy should not be confused with the members of the Brown household. Mary Brown is Paddington's adoptive mother in London, while Aunt Lucy is his Peruvian aunt. The character also appears in screen adaptations, including the films' account of Paddington's origins.