Robert's mother was a daughter of John Tennant (born 1686) of Chapel House, Yorkshire, whilst his father was a son of Jonathan Stansfield of Idle, Yorks,[5] by his wife Miss Barcroft, a daughter of John Barcroft of Foulridge, Lancashire,[6] Serving as a justice of the peace as well as a Captain in the 3rd West Yorkshire Militia, John Tennant Stansfield inherited the Chapel House estate from his childless great-uncle Robert Tennant (born 1725), and adopted the surname and arms of Tennant in compliance with the bequest.
In 1894 he inherited Chapel House from his childless elder half-brother John Robert Tennant (1817–1894), JP, DL, Capt.
For many years he was closely identified with the commercial and industrial life of West Riding of Yorkshire, and he owned extensive estates.
In 1850 he married Harriete Garnett (d.1899), a daughter of the newspaper proprietor Jeremiah Garnett (1793–1870), of Mount Broughton, Manchester,[1] by whom he had 7 sons and 4 daughters,[1] to all of whom a mural monument (post 1936) survives in St Mary's Church, Conistone,[11] as follows: He died at Roffey in Sussex in his 72nd year, on 5 March 1900.
[10] His white marble inscribed memorial tablet survives in St Mary's Church, Conistone.