Joan Flaherty was a pre-War American citizen who was accepted into Vault 114.
Living before the Great War, Joan, her husband Michael, and their daughter Elizabeth were all designated to live in Vault 114. Their family, the Flahertys, were assigned to the Residency A1 section of the vault. However with Vault 114's unending construction they may not have been there when the bombs hit Boston.
Joan Flaherty is mentioned only in Fallout 4.