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Martha Steward was born in or around 1634 at Ilvermorny in Massachusetts, arriving before her fraternal twin sister, Rionach. Her parents, Isolt Sayre, a pure-blood witch, and James Steward, a No-Maj, were the founders of the school. She was named after her paternal grandmother. She also had two adopted brothers: Chadwick and Webster Boot.
Martha was the only one in the family to be born a Squib, and with no magic powers herself, she considered her upbringing at Ilvermorny painful. She was loved by her family regardless.
When she was a baby, her great-aunt, Gormlaith Gaunt, attacked the family. Her parents had been put in to a deep sleep by Gormlaith, but the cries of Martha and her sister woke them. The family were saved by William, the Pukwudgie her mother had befriended several years earlier.
- Pottermore (First appearance)