The London Canal web site has the following from St. Mary's Church Marriage Register, Wolverhampton:

March 4 th. 1860
John Stretch F.A. Wid. Boatman Springfields son of William Stretch deceased
Sarah Ann Knibbs F.A. Spin. Springfields dau.of Joseph Knibbs Boatman
Witnessed by William Thompson and Adelaide Johnson ?

In 1861, we can see John, his wife Sarah and daughter Alice living with Sarah's parents in west Bromwich:

Joseph Knibbs Head 60 Boatman Oxford Banbury
Sarah Knibbs Wife 52 Oxford Banbury
James Knibbs Son 25 Boatman Oxford Banbury
John Stretch Visitor 35 Boatman Cheshire Northwich(?)
Sarah Stretch Visitor 24 Oxon Banbury
Alise Stretch Daur 9 mths Cheshire Hasslington(?)

John's place of birth could be Northwich or maybe Middlewich. Northwich, Middlewich and Hasslington are all geographically close to eachother.
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We believe that John Stretch is the one who died in Northwich District, Cheshire in q4/1861.

(Click image for larger version).This photograph shows Sarah on the left and either her own mother Sarah on the right, or perhaps her mother-in-law, Phebe Elizabeth Tibbetts. We can't be sure which. Written on the back is "Mother and grandmother of Ben, Tom, Joe, James"
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I'm not sure of the reason, but it looks Sarah and two of her siblings were living with their grandmother at the time of the 1841 census return:
WYATT Ann F 60 Independant
KNIBBS Elizabeth F 11
KNIBBS James M 6
KNIBBS Sarah F 3

I'm guessing that Ann Wyatt was their grandmother. They were all living at Burton Dassett, Warwickshire, England.
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There is a little confusion surrounding the two marriages of Sarah. There is strong evidence that she married John Stretch in 1860 and then Thomas Fisher in 1862. We can see from the 1861 census that John Stretch was born in Northwich(?), Cheshire, England and we can also see a John Stretch death was registered in Northwich District, Cheshire in 1861. However, on the marriage certificate of Sarah and Thomas Fisher, she was identified as a spinster.

This could of course have been an error by the Registrar.

The other positive facts that indicate Sarah was married to both John Stretch and Thomas Fisher are:
- for both marriages she's identified as Sarah Ann Knibbs, daughter of Joseph Knibbs, boatman
- in 1861 she was living with John Stretch at her parents house (Joseph and Sarah Knibbs)
- in 1871 she was living just doors away from her parents and sister Elizabeth Martin
- in 1861 we see Sarah and John Stretch listed with a daughter Alise born in 1860
- in 1881 we see Sarah and Thomas Fisher with a daughter Alice born in about 1860 and therefore, before she and Thomas married.

We believe Alice is the daughter of Sarah Ann Knibbs and her first husband John Stretch.