could this be them possibly?(a long shot)
1871
william gray age 30. b. leswalt,wigtownshire. occ. farm servant. head.
mary gray age 35. b. ireland. occ. housekeeper. wife.
sarah gray age 13. b. port patrick,wigtownshire. occ. general worker.daughter.
mary gray age 11. b. ditto. daughter.
william gray age 9. b. leswalt,wigtownshire. son.
jane gray age 6. b. ditto. daughter.
john gray age 3. b. leswalt,wigtownshire. son.
marget gray age 1. b. ditto. daughter.
living at springbank cottars,leswalt,wigtownshire.