Name, born circa 1814, occupation, emigrated to Ohio USA from Cornwall England, from Katia, wife of *Tim Grant Oliver, in an email dated 30 September 2022, where Katia referred to an image of a passenger list:
Passenger Lists, Collector Office, District of New York:
For the Ship Druid that departed Bristol, England and arrived Port of New York on 29 Jun 1840
Names | Age | Profession | Place of Residence | Intended Place of Residence
Thomas Harris, 63, Farmer. Cornwall, Ohio [Father]
Elizabeth Harris, 60, Farmer. Cornwall, Ohio [Mother]
Hannah Harris, 32, Farmer. Cornwall, Ohio
Thomas Harris, 26, Farmer. Cornwall, Ohio
Oliver Harris, 20, Farmer. Cornwall, Ohio
John Harris, 18, Farmer. Cornwall, Ohio
Maria Harris, 17, Farmer. Cornwall, Ohio
William Oliver, 30, Farmer. Cornwall, Ohio [Brother-in-law]
Sophia Oliver, 29, Farmer. Cornwall, Ohio [Sister]

*Tim Oliver is a x3 great grandson of James and Ruth Oliver, his grandfather being Ivor James Clark Oliver 1907-1989.

Date and county of birth, name of wife and year of marriage, one son and three daughters, from an entry for Thomas Harris, son of Thomas and Elizabeth Harris found in February 2023 on the Knox County, Ohio, History & Genealogy page:
http://www.ohiogenealogyexpress.com/knox/oh_knoxco...oxco_bios_1881_h.htm
THOMAS HARRIS, Monroe township, farmer and stock raiser, was born in Devonshire county, England, Jan. 1, 1815. In 1840 he accompanied his parents, Thomas and Elizabeth Harris, to America, and located on a farm in Jefferson township, now owned by John Hobbs, where his parents passed the remainder of their days.
In 1849 he married Miss Ellen McMillen, then of Jefferson township, born in Pennsylvania in 1814, daughter of Joseph McMillen. They settled on his home farm, remained one year, then moved to Defiance, Ohio, remained a few years, and then returned to the old home farm again, where they lived until 1867, when he sold the home farm, and purchased and moved on the farm in Monroe township, where they now reside. Their union resulted in four children, one son and three daughter, all of whom are now deceased except one of the daughters, Keziah M.
Source: History of Knox Co., Ohio, Its Past and Present – Publ. Mt. Vernon, Ohio by A. A. Graham & Co., Publishers, 1881 - Page 684

Brian of nzolivers found in February 2023, land holdings held by Thomas Harris and William Oliver. It was on Plan 51 (PDF of this map attached), of an Atlas originally published in 1871.
The Atlas is called, "Atlas of Knox County Ohio - From actual Surveys by and under the direction of J.A. Caldwell & J.W.Starr".
It was reproduced in 1980 through the sponsorship of the Knox County Genealogical Society, Mt. Vernon, Ohio.
https://www.ohiohistory.org/wp-content/uploads/202...Knox_County_1871.pdf
Land held by:
Thomas Harris - three-quarters across, half-way down
William Oliver - two-thirds across, near bottom

In the above Atals, there are other Harris holdings referenced in the Index:
HARRIS: Ann, Map 57; B., Map 65; D., Map 25; Emor G, Map 61; E., Map 37; Henry C, Map 61; J., Map 29; J.D., Map 27; John, Map 29; M., Map 65; P., Map 29; S., Map 43, 23; Samuel, Map 43; T., Map 29; W.A., Map 57; William, Map 57; William, Map 57.