We can see Thomas and Elizabeth in 1871 living at Love Lane, New Windsor, Bershire, England. Elizabeth's son Thomas Grimsdell is listed under the name of Mansfield:
Charles Mansfield Head M 20 Berkshire
Elizabeth Mansfield Wife F 20 Hampshire
Thomas Mansfield Son M 2 Berkshire
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We see Charles in 1881 living at Wycombe Cottage, Old Windsor, Berkshire, England with his first wife Elizabeth:
Charles MANSFIELD Head M Male 32 Old Windsor, Berkshire, England Farm Carter
Elizabeth MANSFIELD Wife M Female 31 Stokenchurch, Oxford, England Farm Carters Wife
Thomas GREENSDALE Stepson Male 12 Old Windsor, Berkshire, England Scholar

I note that Elizabeth is listed as born in Stokenchurch, Oxfordshire, whereas in 1871 she was from Hampshire. Stokenchurch is actually in Buckinghamshire.
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We see Charles in 1891 living at The Buildings, Union Road, Old Windsor, Berkshire, England, with his mother:
Jane Mansfield Head Widow F 81 Chobham Surrey
Charles Mansfield Son Married M 42 Gardener Domestic Old Windsor Berkshire

I'm not sure what happened to his first wife, Elizabeth, between 1881 and 1891, but I can see no sign of her in 1891. Charles had moved back in with his mother, and is identified as "married" so I presume she was still living in 1891.

We see George's widow in 1891 living at Egham, Surrey:

Ann Knibbs Head 35 Female Egham, Surrey
Emily Knibbs Daughter 16 Female Egham, Surrey
William R Knibbs Son 14 Male Egham, Surrey
Annie Knibbs Daughter 12 Female Egham, Surrey
Charlie Knibbs Daughter 7 Female Egham, Surrey
John Knibbs Son 4 Male Egham, Surrey
William Bryant Boarder 13 Male Egham, Surrey

Town: Egham, Ecc. Parish: St John the Baptist, Civil Parish: Egham, County: Surrey
Registration: Windsor, Egham, 11
Source: PRO/National Archives Reference # RG12/1010 Folio 36 Page 33
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In 1892, Ann married Charles Thomas Mansfield. Sadly he died less than a year later, and it seems that Ann reverted back to using the surname Knibbs.
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In 1901, we see Ann, now twice widowed, living at Egham, Surrey, but am not sure why she reverted to using the sruname Knibbs after her 2nd marriage:

Ann Knibbs Head Widow 44 Egham Surrey
George Knibbs Son 17 Groom Domestic Old Windsor Berks
John Knibbs Son 14 General Servant Old Windsor Berks
Louisa Knibbs Daughter 6 Egham Surrey
Edith Knibbs Niece 12 Old Windsor Berks
George Howard Visitor (Single) 46 Carter Egham Surrey

Edith is the daughter of Ann's brother-in-law Edward Knibbs and his wife Frances. Edward died in 1900 and Frances in 1893 leaving Edith an orphan at the age of just ten years of age.
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We see Ann again in 1911 living at Chester Cottages, Blays Lane, Windsor, Berkshire:

Ann Knibbs, Head Widow F 60 Laundry Worker Egham Surrey
Emily Knibbs Daughter Single F 36 Laundry Worker Old Windsor Berks
William Knibbs Son Single M 34 Plumber Old Windsor Berks
Louisa Knibbs Daughter Single F 17 Englefield Green Surrey
Albert Knibbs Grandson M 11 Scholar Englefield Green
Agnes Knibbs Granddaughter F 5 Portsmouth Hants
George Howard Boarder M 61 Farm Labourer Englefield Green Surrey

I believe that Louisa is Emily's daughter, Albert is Emily's son, and Agnes is a daughter of Amos Knibbs who is Ann's nephew, living in Portsmouth.