There is a baptism of Thomas Richard Thornton, of Sherburn Hill, son of William and Mary Thornton in Thornley St. Bartholomew 18 Jan 1853.
And another: 3 Sep 1876 Jane Thornton, of Wheatley Hill, born 18 Dec 1875, daughter of Thomas & Jane Thornton
Hartlepool St Paul: 18 Sept 1887 Frederick Robson Thornton, of 141 Alma Street, son of Thomas Richard Thornton and Jane, marine engineer, also baptised that day was son John William.
There was another son William Robson Thornton also bapt 1876 (born 1874) in Thornley. I suspect Jane's maiden name is Robson.
Other baptism while on Alma Street were Dora Beatrice , 1889, and Elizabeth Ellen, 1885.
The only difference I see is the occupation of Thomas Richard--mining engineer and marine engineer.
Monk Hesleden St. Mary's marriage: 16 Jun 1873 Thomas Thornton, full age, of Hutton Henry, son of William Thornton, married Jane Robson, age 20, of Thornley, daughter of William Robson
Janis