Margaret, I think this may be George and Ann's daughter, Catherine Crellin b 1817 Liverpool:

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Liverpool, Lancashire, England, Marriages and Banns, 1813-1921
about Catherine Crellin
Name: Catherine Crellin
Age: Full Age
Marriage Date: 10 Nov 1839
Parish: Richmond St Anne
Spouse's Name: John Quaggin
Father's Name: George Crellin
Spouse Father's Name: John Quaggin

Image shows:
John Quaggin/full/bachelor/blacksmith/Smithfield St/father John Quaggin, wheelwright.
Catherine Crellin/full/spinster/Walton/father George Crellin, blacksmith.
Bride+groom both signed.
Witnesses: Edward Cannell and Mary Ann Crellin.

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1841
Lancashire, Liverpool, St Thomas 9/10
Frederick St

Name Age
John Quaggen 25
Catherine Quaggen 20
Ann Quaggen 6 Mo

JQ journeyman smith, "N, not b Lancs"
CQ and AQ born Lancs

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Jean C