From the Coventry Standard, Friday 10 February 1871:
On the 5th February at St. Michael’s Church, Mr. Henry Lewin to Miss Emma Knibbs, both of this city.
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See Henry and Emma's Marriage Certificate

We see Henry and Emma in 1871, shortly after they married, living at 37 Brook Street, Coventry, Warwickshire:
Henry Lewin Head Mar 26 Cotton Dyer Coventry Warwickshire
Emma Lewin Wife Mar 23 Polesworth Warwickshire
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In 1881, we see Henry and Emma living at 8 Court Far Gosford Street, Coventry, Warwickshire:
Henry Lewin Head Mar 36 Silk Dyer Coventry
Emma Kewin Wife Mar 33 Laundress Bradeley Staffordshire
Edwin Lewin Son 7 Scholar Coventry
Ann Knibbs Sister Mar 49 Laundress Oxfordshire

Despite being married and using the name Knibbs, I believe Ann is in fact Emma's older sister, Ann Knibbs.
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In 1891, they were living at the same address in Coventry:
Henry Lewis Head Mar 45 Silk Dyer Coventry Warwickshire
Emma Lewin Wife Mar 43 Laundress Coventry Warwickshire
Edward Lewin Son 17 Book Keeper Coventry Warwickshire
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In 1901 they were living at Court 5, Far Gosford Street, Coventry:
Harry Lewin Head Mar 57 Silk Dyer Warwick Coventry
Emma Lewin Wife Mar 54 Warwick Coventry
Ann Wright Sister-in-Law 72 Warwick Coventry
George Fletcher Nephew Mar 33 Ironmonger Warwick Coventry

Ann is almost certainly Emma's older sister, Ann Knibbs.

In 1911, we see Emma as a widow, living in a workhouse at 11 London Road, Coventry:
Emma Lewin Inmate 63 Wid Staffs Bradeley

In 1901, we see Edward living at 80 Leicester Causeway, Coventry, Warwickshire:
Edward Lewin Head Mar 27 Cycle Traveller Warwickshire Coventry
Rose Lewin Wife Mar 28 Warwickshire Coventry
Leonard Lewin Son 3 months Warwickshire Coventry.

I believe his wife was Rosa Hannah Hands, and they married during q2/1898 in Coventry District, Warwickshire.
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In 1911, Edward and his family were still living at the same address at Leicester Causeway:
Edward Lewin Head 37 Mar (13 years) Coventry
Rosa Hannah Lewin Wife Mar Laundry Coventry
Leonard Lewin Son 10 Coventry
Doris Winnifred Lewin Daur 6 Coventry
Reginald Lewin Son 4 Coventry
Walter John Cobley Lodger 46 Mar (17 years) Bricklayers Labourer Swinford
Matilda Ellen Coblen Lodger 47 Mar

The census indicates that Edward and Rosa had 6 children and one died during infancy.