1851 census:
Piece: HO107/1899 Place: Alternon-Cornwall Enumeration District: 3
Civil Parish: Lawhitton Ecclesiastical Parish: Lawhitton
Folio: 409 Page: 8 Schedule: 30
Address: Higher Luckham
Richard Gregory, 35, Mason
Grace, 35
Mary A, 9
Grace, 7
Hannah, 6
Jane, 3
John, 3M
(all b. Lawhitton except Grace, the transcriber couldn't read her birthplace).
In 1861, there is a visiting Charles Vosper, 7, 'brother's son' - brother of Grace, presumably? B. Lawhitton.
1871, Lawhitton, District 4; Schedule 096
Wm Vosper, 49, St. Stephens, Butcher/Farmer
Hellen Vosper, 49, Steyning, Sussex
Hellen, 23, Launceston
Charles, 17, Lawhitton
Piece: HO107/134/3 Place: East-Cornwall Enumeration District: 1
Civil Parish: Lawhitton Ecclesiastical Parish: -
Folio: 9 Page: 12
Address: Lower Luckham
1841 census (!)
Richard Gregory, 25, Mason, Cornwall
Grace, 25, outside census county
I don't think that this Richard is the one who married Martha Ford Goodman, between the 1841 census and the fact that there's little or no break between Martha getting transported in 1842 and the birth of Mary A shown in the 1851 census. Unless Mary A was Martha's child, born before Martha was transported and stayed with her father in Cornwall?
There is a Richard Gregory in Saltash in 1841, Journeyman Mason, who could be the one m. 1842, if his wife d. between then and 5th April:
Piece: HO107/135/13 Place: East-Cornwall Enumeration District: 1
Civil Parish: Saltash Borough Ecclesiastical Parish: -
Folio: 27 Page: 48
Address: Fore Street
Richard Gregory, 30, Journeyman Mason
Mary, 30
Eliza, 3
Charles, 1
all b. Cornwall
Also in Saltash, and on the same street: Henry Goodman, 50, a Shipwright, with wife Elizabeth, 50, Grocer, and daughter Mary, 15:
Piece: HO107/135/13 Place: East-Cornwall Enumeration District: 1
Civil Parish: Saltash Borough Ecclesiastical Parish: -
Folio: 23 Page: 40
Address: Fore Street
(these are all from Freecen.)
Somebody might be able to find the Richard Gregory aged 30 in 1841 on the 1851 census (or his children) and see what's happened to them.