She was the former Katherine [Kate] Foster, daughter of Ludovic Anthony Foster [1908-1990], of Greatham Manor, Pulborough, Sussex, by his wife the former Pamela Margaret Wilberforce [1909-97], scion of that landed gentry family. She was a granddaughter of Samuel Wilberforce [1874-1954], by his wife the former Katharine Sheepshanks [1881-1963], of that landed family, &c.
She married Sir Christopher Davson, as his second wife, in 1975. Her husband died 21 December, 2004. The marriage was childless.
Lady Davson's step-son is Sir George Davson, 4th Baronet.