I assume that you have searched the WW1 Military Appeal Tribunals. William appears in the database.
The Gloucester Journal of 15 July 1916 reported as follows:
“The Gloucestershire Appeal Tribunal under the Military Service Act sat at Lydney on Friday week. Mr Hyatt presided, the other members present being Messrs. R.D. Cumberland-Jones, H.E. Waddy and E Bourne with Mr E.T. Garden (Clerk).
An Insurance agent, whose application for exemption was refused, said he could take no part in warfare. Mr S J Elsom would support the honesty of his statement. The Chairman pointed out that Mr Elsom was chairman of the Tribunal which refused the application. Applicant said his Sunday School training prevented him from going to war. Answering Lieut. Wood on behalf of the military authorities, appellant said he would object to joining the R.A.M.C. He wanted to stop the war. Lieut. Wood: The way to do that is to beat the Germans. - The Court granted exemption from combatant service. - Appellant: I will not attend; if you want me you must fetch me.”

William married Janey Ackroyd on 10 January 1901 at Holy Trinity Church Lawkholme, in the County of York.
Details:
Groom: William Lovice Wintle aged 22 years, Bachelor, Railway Porter of 4 Plover Street, Keighley. Father: William Henry Wintle, Engine Driver
Bride: Janey Ackroyd aged 18 years, Spinster, Dressmaker of 4 Plover Street, Keighley. Father: Pickles Ackroyd (deceased) Mechanic
Both signed.
Witnesses: Nimrod Ackroyd and Nancy Ackroyd.
Officiating Minister: Wm Seelly, Vicar

The 1911 Census tells us that William and Janey’s first child was Blanche born in 1901.
Births Jun 1901
Wintle Blanche Keighley 9a 203

Both Edna and Harold died in 1905:
Deaths Sep 1905
WINTLE Edna 2 Keighley 9a 11[8_]
Deaths Dec 1905
Wintle Harold 0 Keighley 9a 131

Blanche married Ernest Rawcliffe on 24 February 1923 at Victoria Park Wesleyan Chapel, Bradford Road, Keighley.

At this point I would mention that the search for living relatives is strongly discouraged on this Forum and I would refer you to the Posting Guidelines (see link near top of the page). Hopefully the information from the Tribunal will go some way to helping you with your research.

Mike

This from the BNA Gloucester Journal - Saturday 16 September 1916

Coleford.

At a special Court at Coleford on Wednesday (before Messrs. T. T. Taylor and J. W. Porter), William Lovice Wintle (38), insurance agent, Parkend, was brought up in custody and charged by P.C. Bartlett, under the Military Service Act, with being an absentee from his Majesty’s Forces.—Prisoner, who is conscientious objector, and had been exempted from combatant service only, contended that he could not be an absentee from something he had never joined.— Lieut. Barnsley, in charge of the Lydney Recruiting Office, stated that prisoner was not to be called until the 4th inst.. but as a matter of fact he received until the 11th inst. The notice requesting him to present himself on that date was ignored.—The Bench imposed the minimum penalty of £2, and ordered prisoner to be handed over to the escort.