Thomas was born in c 1823 and may have arrived in SA with his brother James on Rajah, or else arrived on Theresa with a wife and 2 children ( the wife either died on board or shortly after. I have not seen any mention of the 2 children.
They were all born in Stithians Cornwall.
Thomas & Elizabeth had two sons William (1848) and Thomas (1850) both born at Montacute S.A. A daughter Elizabeth Francis was born in 1852. Her birth cert. (difficult to read) says District of Adelaide, her death Cert. says Mt. Barker. her son's birth cert says Carrington. Elizabeth Francis married Charles Bell in Mt. Gambia Jan 1872, her address at that time was Drop Drop Mt Gambier.
Thomas and Elizabeth had another daughter Catherine who is listed on Elizabeth Francis' marriage cert. as living at Dartmoore Vic. and is listed as deceased on the death Cert. of Elizabeth Peters.
The death Cert. of Thomas' wife Elizabeth (Harris) in 10 Oct 1906 at Parkes NSW says that she was 82 and was in S.A. for 53 years and 7 years in NSW. She died at her Daughter Elizabeth Francis and Son in Law Charles Bell's farm. There is no mention of her being a widow on her death cert.
Her 2 sons had come up to the Parkes/ Forbes district at around 1890 with Elizabeth Francis & Charles.
Hope this is all clear and of some help.
Ding I am wondering if Catherine may have been one of the two chn who may have accompanied Thomas on the
Theresa and perhaps Eliza Harris, who died in 1848 was the other child.
http://www.slsa.sa.gov.au/fh/passengerlists/1847Theresa.htmHave you found a possible first marriage for Thomas PETERS in England?
When the chn were listed on Elizabeth's death cert, where in the order did Catherine feature?
Just for your records I detail their the childrens' birth registrations from the South Australian indexes - just in case you want transcriptions.
PETERS William 19 Dec 1948 Father Thomas PETERS Mother Elizabeth HARRIS at Montacute Ref Ade 2/108
PETERS Thomas 7 Aug 1850 Father Thomas PETERS Mother Elizabeth HARRIS at Montacute Ref Ade 3/96
PETERS Elizabeth Francis 2 Jul 1852 Father Thomas PETERS Mother Elizabeth Unknown. Place of birth not recorded Ref Ade 4/41
[There is a Carrington Street in Adelaide]
I can't see the death of a Catherine with parents Thomas PETERS and Elizabeth HARRIS in the Victorian indexes. Someone else may find the death after 1872 and before 1906.
Cheers
Cando