John Barker married Jane (c. 1798–1884) daughter of Col. William Swinburne on 14 August 1828 at Keynsham, Somerset. They had no issue. Lady Barker-Mill died aged 85 at Mottisfont Abbey, Hampshire on 2 January 1884. She bequeathed East Dean House to Henry Dugdale Curzon, son of
Earl Howe and husband of her relative Eleanor Young Swinburne. ==References==