Edith Sitwell was born in Scarborough, Yorkshire, the only daughter of the eccentric Sir George Sitwell, 4th Baronet, of Renishaw Hall; he was an expert on genealogy and landscaping. Her mother was the former Lady Ida Emily Augusta Denison, a daughter of the Earl of Londesborough and a granddaughter of Henry Somerset, 7th Duke of Beaufort. She claimed a descent through female lines from the Plantagenets.
Sitwell had two younger brothers, Osbert (1892-1969) and Sacheverell Sitwell (1897-1988) both distinguished authors, well-known literary figures in their own right, and long-term collaborators. Sacheverell married a Canadian woman, Georgia Doble, in 1925 and moved to Weston Hall in Northamptonshire.
Her relationship with her parents was stormy at best, not least because her father made her undertake a "cure" for her supposed spinal deformation--involving locking her into an iron frame. In her later autobiography, she said that her parents had always been strangers to her.
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