On 21 May 1857, Sinton married Eleanor Hemington at the Friends' Meeting House at Chatteris, Cambridgeshire.
[citation needed] John Sinton probably worked with his brother Thomas at Laurelvale until the 1870s,[2] when he developed the mill at Ravernet, and built houses and a schoolroom there to accommodate his employees and their families.
[3] Sinton devoted all his energy to the Ravarnette Weaving Company, which, at his death in 1890, was taken over in partnership by his youngest son, Edwin (1872–1935), and Benjamin Courtenay Hobson (1862–1935), the husband of Caroline.
[4] Sinton and Hobson ran the Ravarnette Weaving Company with great success by developing a form of linen cloth that was used to cover the fuselage of the earliest aeroplanes.
However, on 10 October 1927, the company was wound up due to an overload of stock that was unable to be paid for by a bankrupted American firm.