- She was born in Los Angeles, California, and weighed 6 lbs & 14 oz and measured 20 inches long at birth.
- She has an older half-brother, Jack McDermott, from her father's previous marriage. She has an older brother Liam McDermott and an older sister, Stella McDermott. She also has a younger brother, Finn McDermott.
- Unlike her big brother and sister, Hattie's parents chose to keep her gender a surprise but were fairly confident she would be a boy. As a result, they didn't have a name picked out for her once she was born.
- Granddaughter of David McDermott, Doreen McDermott (died), Aaron Spelling and Candy Spelling.
- Hattie's middle name Margaret was chosen to honor Tori Spelling's childhood nanny. Liam McDermott and Stella McDermott nicknamed her Hattie Cat.
- Daughter of Tori Spelling and Dean McDermott.
- Niece of Randy Spelling.
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