Kate Boyd

Kate Boyd was the sister of Annette Birkin, and the aunt of Sherry Birkin. She took Sherry in after William and Annette's deaths. Claire Redfield noted that she was nothing like Annette. David Trapp reflected that she was one of the best lawyers in California, good enough to give Umbrella incentive to stay away from Sherry.

In Resident Evil: City of the Dead, it is mentioned that, in accordance with the Birkin's wills, shoul anything happen to them, Sherry would be sent to live with William's sister. In Resident Evil: Underworld, however, Kate Boyd is stated to by Annette's sister.