maidmarianoops, What is the point you are making with the posting of that census information

I'm puzzled ...
The mystery with which this thread began is spelled out in the very first post.
The original poster told us she had been searching for the parents of her Gggmother Mary (SMITH) PALMER b 1858. She had located Mary (as SMITH) with her parents in the 1861 census in Cornwall; she had then located Mary's parents and some older siblings in the 1851 census in Cornwall as SLACK; she had then located the 1842 marriage of Mary's parents - George SLACK & Amelia KNORRTON; but she had been unable to trace George (whose occupation changed from coachmaker to hawker) or Amelia any further and she had been unable to find why the family changed its surname from SLACK to SMITH.
Much light has been shed on the mystery over the previous 9 pages (especially with the clarification of Amelia's maiden surname as CARNATON - variously spelled).
The
relevant 1851 and 1861 census entries (in Cornwall) for George & Amelia and family were posted in the original post which began the thread.
The
relevant 1871, 1881, and 1891 census entries (in Cornwall) were posted in Response #3.
And possibilities have been suggested for entries in the 1841 census for George and for Amelia before their 1842 marriage (in Cornwall).
JAP