|Spouse(s)||Alfred Ezra Sassoon|
Theresa was a member of the Thornycroft family. Her father was Thomas Thornycroft (1815–1885) and her mother, Mary Francis (1814–1895). Her brother Sir Hamo Thornycroft RA, sisters Alyce Thornycroft and Helen Thornycroft were all artists, while her brother Sir John Isaac Thornycroft was the founder of the Thornycroft shipbuilding company.
- Michael Thornycroft Sassoon (1884–1969).
- Siegfried Sassoon (1886–1967).
- Hamo Watts Sassoon (1887–1915).
After they separated, she continued to live in the village of Matfield in Kent, and was immortalised in the memoirs of her son Siegfried.
- Hart-Davis, Rupert. "Sassoon, Siegfried Loraine". Oxford Dictionary of National Biography (online ed.). Oxford University Press. doi:10.1093/ref:odnb/35953.CS1 maint: ref=harv (link)<templatestyles src="Module:Citation/CS1/styles.css"></templatestyles> (Subscription or UK public library membership required.)
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