Hi Tanya
Prepare to be amazed! I'm no nearer solving the conundrum of John MacCauley but I've sorted Louisa Parkinson, or at least I think I have. And, what's more the 1891 shows she was born in Antrim and not just Ireland so that may help if you think she may be connected to the MacCauley family. I've never found any lead to my Irish connections because on the censuses the only place of birth given is usually just Ireland.
First of all, Charles Parkinson married Louisa Harris, Dec Quarter 1868, West Derby. Wasn't sure about this until I came across Louisa on the 1891 Census below.
1851 Census - Charles was living in Scotland Road with his mother, Sarah,Widow, 35, Seamstress, Born Liverpool, and sister, Martha, aged 5 and also born Liverpool.
1861 Census - unable to trace Louisa but Charles, 19, was working as a commercial clerk and living with his mother, Sarah, a widow aged 44 whose occupation was dressmaker. Sarah was born in Liverpoool. No sign of Martha with family and the only one possibility I could find was Martha Parkinson, aged 14 who was a Scholar at the Blue Coat School, Liverpool.
1871 Census
Charles and Louisa were living at 60 Prenton Lane, St Catherines, Tranmere, Cheshire and not Lancashire as you believed.
Charles Parkinson, 29, Commercial Clerk, Born LIverpool
Louisa Harris, 20, Born Ireland
John Macauley,Nephew, 5, Born Liverpool
Elizabeth Haran, Visitor, 30, Married, Born Liverpool
Elizabeth Anne Haran, 1, Born Liverpool
(Included the visitors in case the surname had any relevance for you)
1881 Census details you have are correct.
1891 Census
York Villa, Fort Street, Liscard, Wallasey
Charles Parkinson, 47, Mercantile Clerk, Born LIverpool
Louisa Parkinson, 37, Born Antrim, Ireland
John Harris, Nephew, 18, Mercantile Clerk, Born Liverpool
Joseph Harris, Nephew, 16, Mercantile Clerk, Born Liverpool
(Nephews' surname seems to confirm that Louisa'a surname was Harris)
1901 Census
Charles, 58, and Louisa, 48, were still living in Fort Street, Wallasey and Charles was still occupied as a commercial clerk.
Hope this helps - if I find anything else that seems relevant I'll get back to you.
Good luck
Marie.