 His wife's mother, Elizabeth Maria Campbell (1750–1797), was the daughter of the Rev.John Campbell (1724–1772) LL.D., of Newgarden House; Vicar General of Tuam, a cousin of Elizabeth Gunning and Maria Gunning, by his wife Catherine Younge.Mrs Graves was the granddaughter of Sarah (Wilder) Drought, sister of the eccentric Theaker Wilder.