Sylphiel's only known family is her father, Elc, who was a priest in Sairaag, and her uncle, whom she lived with after Sairaag was destroyed by Copy Rezo. Elc was killed when Copy Rezo destroyed most of the city; he was later resurrected by Hellmaster Fibrizo, only to be killed again when Fibrizo was destroyed by the Lord of Nightmares. There is no mention of her mother in the novels, manga, or anime.
Sylphiel is a priestess of the shrine to Flare Dragon Ceifeed in Sairaag. When she was young, she took the Bless Blade from the shrine and hid it under the holy tree, Flagoon. This later proved to be useful, as the sword was needed to defeat Copy Rezo-Zanaffar. After each destruction of Sairaag, Sylphiel was involved in the efforts to rebuild it. Her life revolves around helping other people.