Just had a quick look at a couple of Public Members' Tree on Ancestry

Richard GAMMON c1819 (no mention of his parents) - married Harriet/Harriott MILLARD, born 1824, Westbury Wilts - married 1858, Bermondsey, London

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1871 Census, Wiltshire, Westbury
Warminster Road

Richard GAMMON - Head - married - 51 Millwright, born Gloucestershire, Newent
Harriet - wife - age 46 - born Wilts, Westbury
Mary GAMMON, mother - W - age 69 - born Gloucestershire, Newent
Rachel MILLARD, Mother - W - age 67 - born Wiltshire, Westbury
Janet DUNN - Niece, age 13 - born Wiltshire, Westbury
Elizabeth SOUTHWARD - visitor, age 38, born Cumberland, Whitehaven