Sigrid Ingerman

 Sigrid Ingerman is the twin sister of Astrid Ingerman, older sister of Stoick Ingerman and second-born child and daughter of Fishlegs Ingerman and Valkyrie Haddock, granddaughter of Stoick and Valka, niece of Hiccup Haddock and Astrid Hofferson and cousin of Zephyr and Nuffink Haddock. She is named after her maternal great-grandmother (whose name is also Valkyrie's)