Steward was the surname of a Muggle family although they do have some wizarding blood. James Steward was a No-Maj who founded Ilvermorny School of Witchcraft and Wizardry along with his wife Isolt Sayre who was an Irish witch. They had twins daughters. The elder daughter was Martha Steward II, named after James' mother. Martha was a Squib and therefore had no magical powers. The younger daughter, Rionach was a half-blood witch who may have been able to speak parseltongue.
- Martha Steward — mother of James Steward
- James Steward — founder of Ilvermorny School of Witchcraft and Wizardry
- Martha Steward II — Squib daughter of James and Isolt Sayre
- Rionach Steward — daughter of James and Isolt Sayre and Defence Against the Dark Arts teacher at Ilvermorny School of Witchcraft and Wizardry