He was married to Adrienne Alpin (m. 1965–1995), with whom he had two sons, Damon and Jason Hart-Davis. His second wife is psychologist Dr. Susan Blackmore, whom he married on 19 June 2010. His siblings are the journalist Duff Hart-Davis and Bridget, the dowager Lady Silsoe. He is an uncle of the journalist Alice Hart-Davis.
He was married to Adrienne Alpin (m. 1965–1995), with whom he had two sons, Damon and Jason Hart-Davis His second wife is psychologist Dr. Susan Blackmore, whom he married on 19 June 2010. His siblings are the journalist Duff Hart-Davis and Bridget, the dowager Lady Silsoe. He is an u.ncle of the journalist Alice Hart-Davis.