I think Daniel married a second time to Mary Ann Allen she is too young to marry and have children. in the 1851 census. So we are looking for an earlier marriage to someone also called Mary.
Sources
Name Daniel Robinson
Spouse's Name Mary Ann Allen
Event Date 29 May 1844
Event Place Cathedral,Manchester,Lancashire,England
↑ "England Marriages, 1538–1973 ," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:NJRT-NX2 : 10 February 2018), Daniel Robinson and Mary Ann Allen, 29 May 1844; citing Cathedral,Manchester,Lancashire,England, reference , index based upon data collected by the Genealogical Society of Utah, Salt Lake City; FHL microfilm 438,203, 438,204, 438,205, 438,206, 438,207.
↑ "England and Wales Census, 1851," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:SGPY-NH3 : 27 October 2017), Daniel Robinson, Stretford, Lancashire, England; citing Stretford, Lancashire, England, p. 13, from "1851 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO HO 107, The National Archives of the UK, Kew, Surrey.
↑ "England and Wales Census, 1861," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:M7DC-334 : 14 December 2017), Daniel Robinson, Hulme, Lancashire, England; from "1861 England, Scotland and Wales census," database and images, findmypast (http://www.findmypast.com : n.d.); citing PRO RG 9, The National Archives, Kew, Surrey.
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