Chester Chronicle, Saturday, 12 Sep 1857, page 5
MARRIAGES
2nd inst., at St. Saviour's church, Oxton, Cheshire, by the Rev. W. Cocknoft, George, second son of the late Rev. George Burton, of Lincoln, to Maria Eliza, eldest daughter of the late Rev. William Richardson, of Hamilton-square, Birkenhead.
Chester Chronicle, Saturday 29 Nov 1851, page 5
MARRIAGES
18th inst., at Tarporley, by the Rev. John Prosser, M.A. curate, Mr. William Richardson, draper, to Elizabeth, widow of the late Mr. James Walton, draper, Tarporley.
Chester Chronicle, Saturday, 05 Jul 1851, page 3
DEATHS
27th ult, at Claughton, Birkenhead, aged 54, the Rev. Wm. Richardson.
Chester Chronicle, Friday, 09 Feb 1838, page 3
LOCAL
The late Rev. Wm. Richardson, for fifty-three years the revered Vicar of St. John's, Chester, has bequeathed the very munificent sum of 600 pounds, for the purpose of purchasing an ORGAN for that Church.
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Perhaps this last-mentioned Rev. Richardson was your fella's father. Perhaps your fella was born in Cheshire. Perhaps not. Just a thought. I went through an online search for Wm Richardsons in Cheshire from 1838 through 1851, and this is all I could find.
My guess is that there may have been a previous wife, possibly married (and buried) in France. My daughter looked through the British-Subjects-born-in-France records that are available online, but neither Maria nor Laura appears. Many of the records from the pre-1860 period were destroyed in several fires. The fact that both girls were born in Paria makes it even worse, because the French government is putting a lot of the smaller town records online right now, but Paris isn't well represented.
The 1861 census has Maria being born c. 1834, which makes it more likely that Eliza is her mother. (Doesn't hurt, either, that Maria marriage announcement lists her middle name as Eliza.) The fact that they're both listed as Gentlewomen is interesting, too. Not just "independent means".
I have looked through the Somerset and Cheshire newspapers for 1860-1 and can't find George's death record (spelling it Barton or Burton).