This is the best we can do as a proof of John birth to Help Ann. and Roy?
1901 census  RG13/ Piece 4396/ Folio 76/ Page: 26.   Address: 7, Vine St, Masborough.
Allan Cocking     60
Mary Cocking    62
Allan Cocking    24
Joseph Cocking    17
Hannah Wood    50,  general servant domestic, born Batley Carr.
Hannah 66 in 1911c
Allan Cocking is the father of Charlotte, John Henry Wood's wife.
Marriage of John Henry Wood to Charlotte Cocking  9c 840 Marriages Dec 1893 Rotherham
Birstall Parish register
Page 161 event number 333
Marriages
James Wood -  age 41- Widower- OCC Iron Moulder- Abode Heckmondwicke -father John Wood Fathers Occ Cordwinder.
Hannah Sykes -age 31 -spinster- Occ (Blank)-Abode  Staincliffe Batley carr
Father Joseph Sykes Father Occ Engine Tinder (Tinderman)
James Wood signed his name
Hannah Sykes left her Mark
In press of (Witnesses)
Richard Goohall
James Robuck
Mr (Unreadable first name) Kemp curate
Poll books are showing nothing and all I could find was  Hannah Sykes of
Central St Staincliffe in Batley Carr  Poll book 1868
1891c
Clough Rd, Masbrough, Rotherham.
Hannah Wood, head, wid, 35, b. Dewsbury,
John H. Wood, son, s, 19, Brick Maker, b. Dewsbury.
Henry Sharpe, lodger, s, 42, General Labourer, b. Ivison 
RG12/3849/94/22
Hannah is still living with the Cocking's in 1911 where her age is stated as 66.