Emma Cecilia Ida (Ida) Farrer (1854–1879)
Emma Cecilia Ida (Ida) Darwin (1880–1946)

Only daughter of Thomas Henry Farrer and Frances Farrer (née Erskine); distantly related to Charles and Emma Darwin. When her father remarried, became stepdaughter of Katherine Euphemia (Effie) Wedgwood. Married Horace Darwin in 1880; resided at The Orchard, Cambridge, from 1884. Active in Cambridgeshire charities related to mental health.