I am going to have to deal with these separately as time allows.
I am attaching three photos from the Bond Street Methodist Cemetery, now known as the Oshawa Pioneer Memorial Garden.
- Elizabeth's stone that you mentioned (1851)
- their son William Henry's stone (1837)
- the 1853 stone of Robert Rundle, son of Robert & Elizabeth Rundle
I do not find a match for William son of Thomas and Elizabeth in the CFHS DB. He was 3-11-7 when he died 7 Mar 1837, which computes to a birth 28 Mar 1833. The only baptism in the CFHS DB after this date is the William Woodcock Hosking 8 Jan 1836 Breage. The image is at
https://familysearch.org/pal:/MM9.3.1/TH-266-11785-107292-35 and does not include a birth date. He could have been born in Canada.
Elizabeth was born about 1781 (age 70 at 1851 death). So she probably first married about 1800-1810. If her marriage to Thomas Hoskin was her first. Here are all the Thomas-Elizabeth marriages in all Cornwall for all dates, in the order returned by the search (not sure what that order is):
Husband Name Wife Name Parish Date Remarks
Thomas HOSKEN Elizabeth WARREN St Buryan 20 Jan 1827
Thomas HOSKEN Elizabeth DYER St Pinnock 3 Jul 1677
Thomas HOSKIN Elizabeth PHILLIPS Endellion 21 Dec 1805
Thomas HOSKIN Elizabeth WOOLCOCK Helston 17 Jan 1832
Thomas HOSKIN Elizabeth NECARRES Lamorran 17 Nov 1695
Thomas HOSKIN Elizabeth GILL Lesnewth 13 May 1830
Thomas HOSKIN Elizabeth WILTON Liskeard 31 Aug 1612
Thomas HOSKIN Elizabeth HOCKING Luxulyan 14 Sep 1801
Thomas HOSKIN Elizabeth JENKIN St Allen 5 Nov 1836
Thomas HOSKIN Elizabeth PETERS St Austell 25 Oct 1778
Thomas HOSKIN Elizabeth TREVEEAN St Erth 17 Nov 1722
Thomas HOSKING Elizabeth WEBBER Lelant 16 Oct 1824
Thomas HOSKING Elizabeth BENNETT Liskeard 9 Dec 1754
Thomas HOSKING Elizabeth HALL Mylor 7 Mar 1788
Thomas HOSKING Eliza TRATHEN Phillack 27 Sep 1829
Thomas HOSKING Elizabeth PELLOW St Erth 3 May 1826
Thomas HOSKING Eliza HUNKIN St Hilary 25 Mar 1830
Thomas HOSKING Elizabeth OSBORN St Hilary 21 May 1836
Thomas HOSKINS Elizabeth KELLY Helston 29 Dec 1651
Thomas HOSKYN Elizabeth HOSKYN Blisland 10 Sep 1753
Thomas HOSKYN Elizabeth STROUT Blisland 17 Sep 1543
Thomas HOSKYN Elizabeth POLGLACE Breage 20 Sep 1590
Thomas HOSKYN Elizabeth MORRISH Lelant 14 Jan 1670/71 ? BT only
Thomas HOSKYN Elizabeth THOMAS Phillack 4 May 1728
Thomas HOSKYN Elizabeth GILBERT Roche 21 Sep 1700 BT only
Thomas HOSKYN Elizabeth CHAPMAN St Allen 1 Jan 1805 BT only
So this one is not going to be simple to research. The Oshawa families were mainly from Luxulyan and St Blazey. There are only three marriages in the 1800-1810 period, and one of those is at Luxulyan: wife Elizabeth Hocking married 14 Sep 1801.
Searching baptisms on Eli* Ho*k*n* returns more than the 150 limit of the CFHS DB. Restricting it to just Luxulyan does find one: Elizabeth Hosken to Richard and Jinifer baptized 14 Oct 1781. This could be her, but with so many other possibilities to consider, it would take a lot more research to narrow it down.
Similarly there are just too many Tho* Ho*k*n* hits in all of Cornwall over all years (there is NO selection nor sorting by year, which is one of the very few problems with the CFHS DB). There are surprisingly few in Luxulyan:
Surname Forename Relation Father Surname Father Forename Mother Surname Mother Forename Parish Baptism Date Remarks
HOSKIN Thomas Son HOSKIN Thomas - Elizabeth Luxulyan 3 Mar 1814
HOSKING Thomas Son HOSKING Richard - Jinifer Luxulyan 26 Dec 1772
HOSKING Thomas Son HOSKING William - Jone Luxulyan 15 Jun 1739
HOSKINS Thomas James Tremelling Son - - HOSKINS Catherine Luxulyan 25 Jan 1864
The 1772 is the only candidate, but it may just as well have been that the Thomas married 1801 at Luxulyan was not born at Luxulyan. There are just too many to research easily.
Going back to the baptisms and searching for Luxulyan children of an 1801 marriage, there were many:
Surname Forename Relation Father Surname Father Forename Mother Surname Mother Forename Parish Baptism Date Remarks
HOSKEN Elizabeth Dau HOSKEN Thomas - Elizabeth Luxulyan 1 May 1805
HOSKEN Richard Son HOSKEN Thomas - Elizabeth Luxulyan 13 Apr 1804
HOSKEN Richard Son HOSKEN Thomas - Elizabeth Luxulyan 4 Mar 1810
HOSKIN Ann Dau HOSKIN Thomas - Elizabeth Luxulyan 27 Mar 1812
HOSKIN Jane Dau HOSKIN Thomas - Elizabeth Luxulyan 7 Apr 1816
HOSKIN Thomas Son HOSKIN Thomas - Elizabeth Luxulyan 3 Mar 1814
HOSKIN William Son HOSKIN Thomas - Elizabeth Luxulyan 2 Aug 1802
HOSKYN Mary Dau HOSKYN Thomas - Elizabeth Luxulyan 16 Aug 1807
The baptisms end at 1814 -- long before the 1833 son buried in Oshawa in 1837. In 1833, Elizabeth would have been 52 -- not impossible but really unusual.
I do think the Luxulyan couple are the most likely ones for the Elizabeth who died 1851, but that leads to a mother giving birth at age 52, making me wonder if there were two Thomas & Elizabeth Hoskin couples in Oshawa.
The 1814 son could have married young and been the 1833 father. There are only 3 pre-1833 Thomas-Elizabeth marriages in the list above, and none are at parishes near Luxulyan (Helston, Lesnewth [unless it was the one by Par, which seems unlikely for the DB], St Hilary). So a Canada marriage may have been what happened, if there were two couples.
The bottom line here is that this one is not going to be easy to figure out.
Not sure how the Rundles fit in. There are no Robert Rundle-Elizabeth Ho*k*n* marriages in the CFHS database ... in fact no marriages of a Rundle to a Ho*k*n* wife named Eliza or Elizabeth. So this too may have been a Canada marriage ... or perhaps Devon.