This series of census entries suggests that the Samuel Parry who was the son of John and Caroline was alive on 2/4/1871. Perhaps the Durham Samuel Parry found by Jeff shouldn’t be discounted?

GR 1851 Census, Blaisdon, Nott Wood

John PARRY, Head, Mar, 38, Ag Lab, b. Glos. Longhope
Caroline, Wife, Mar, 28, Glos. Awre
John P GLOVER, Son, 9, Scholar, Glos. Saint Brivals
Mary A PARRY, Daur, 6, Glos. Longhope
Harriot, Daur, 3, Glos. Blaisdon
Samuel, Son, 7m, Glos. Blaisdon
John GLOVER, Inmate, 2m, Glos. Blaisdon

GR 1861 Census, Longhope, Cottages
John PORRY, Head, Mar, 48, Ag Lab, Gloster, Longhope
Caroline, Wife, Mar, 37, Charwoman, Gloster, Awre
Harriett, Daur, Un, 13, Gloster, Blaisdon
Samuel, Son, 10, Scholar, Gloster, Blaisdon
William, Son, 8, Scholar, Gloster, Blaisdon
James, Son, 6, Gloster, Blaisdon
Emily, Daur, 4, Gloster, Longhope
Henry, Son, 2, Gloster, Longhope
Elizabeth, Daur, 1, Gloster, Longhope

GR 1871 Census, Longhope, Village

John PORRY, Head, Mar, 58, Ag Lab, b. Gloucestershire, Longhope
Caroline, Wife, Mar, 48, Gloucestershire, Awre
Samuel, Son, Un, 20, Coal Miner, Gloucestershire, Blaisdon
William, Son, Un, 18, Ag Lab, Gloucestershire, Blaisdon
James , Son, Un, 16, Ag Lab, Gloucestershire, Blaisdon
Elizabeth, Daur, 10, Scholar, Gloucestershire, Longhope
Julia, Daur, 8, Scholar, Gloucestershire, Longhope
Sarah, Daur, 6, Scholar, Gloucestershire, Longhope
Charles, Son, 4, Gloucestershire, Longhope

For ref, found by Jeff:-

GR 1881 Census, Elvet, Durham
William COLTMAN?, Head, Mar, 48, Coal Miner, b. Durham, Pensher?
Jane, Wife, Mar, 37, Durham, Gateshead
Samuel PARRY, Boarder, Un, 30, Coal Miner, Gloucester, Longhope