Catherine Sophia Boothby Heathcote was the daughter of Revd Robert Boothby Heathcote and Charlotte Sotheby (daughter of Admiral Thomas Sotheby). She was born in 1841. Her father was the Rector of Chingford and the Lord of the Manor of Chingford. He had grown up at the family seat of Conington Castle, to the south of Peterborough.
In 1900 Catherine and her younger step-sister, Louisa Gertrude Boothby Heathcote bought land including a house called Clevehurst, to the north of Bells Hill in Stoke Poges. Catherine had one older sibling called Charlotte who became the Countess of Carysfort. Either side of Catherine’s death in 1913, there were deaths in Clevehurst:- her brother in-law, William Proby, 5th Earl of Carysfort (d.1909) and his wife, her older sister, Charlotte (d.1918). They owned much land and Glenhart Castle in Co. Wicklow, Ireland as well as Elton Hall to the west of Peterborough.