Rio McDonald's aunt who provides shelter to Doc Holliday and Billy the Kid at her home when they are being pursued by a posse.
Guadalupe is Rio's closest explicitly identified family connection.
The plot identifies Guadalupe as Rio's aunt and places Rio's home under their shared household.
Guadalupe's home provides temporary refuge to Doc and Billy.
Doc flees with Billy to the home of Rio and her aunt Guadalupe while a posse pursues them.
Guadalupe is connected to Billy through the refuge at her home.
Billy is taken to the home of Rio and Guadalupe while he is being pursued by a posse.
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