« Reply #20 on: Monday 13 April 20 14:34 BST (UK) »
The Mary Kerr, mother of Louisa, is the daughter of the Mary, formerly Jenkins, who married Gevert. On later census entries, Mary Kerr is noted as widow, but the 1871 entry looks like Unm to me.
There's a burial entry for Mary Morlken aged 42 28 July 1857 of 6 Charles St.
Gevert was a bachelor on his marriage to Mary Kurr.
There's a workhouse admission & discharge for some of the Morkin family in 1856 suffering from fever. Gevert is Grayford, Claus is Clousey. There's a 12 year old David, he may be Gevert junior.

Cornwall: Allen, Bevan, Bosisto, Carnpezzack, Donithorn, Huddy, James, Retallack, Russell, Vincent, Yeoman
Cards: Thomas (Llanbadarn Fawr)
Glam: Bowler, Cram, Galloway, James, Thomas, Watkins
Lincs: Coupland, Cram
Mon: Cram, Gwyn, John, Philpot, Smart, Watkins
Pembs: Edwards (St. Dogmael's)
Yorks: Airey, Bowler, Elliott, Hare, Hewitt, Kellett, Kemp, Stephenson, Tebb