Some notes I've jotted down so far, better share now before this gets too out of control :*)
The children that I can't find are listed on the death cert as Mary Holmes,65 YO, Sarah Clarke, 46 YO, Henry Clarke, 43 YO and Joseph Clarke whom I have found, but he called himself Holmes.
Now have found an online tree which could help answering part of your question:
Mary HOLMES = b. 1854 [Tumut, NSW]
Joseph HOLMES = b. 24 Dec 1876 [Adaminaby NSW], d. 1963 [Batlow NSW]
They also list a "Harry HOLMES born 1876 in Adaminaby"; Joseph & Harry being the last of the children.
Twins born after their father's death? Who both took on the surname of their stepfather?
Sarah is the only one not accounted for -- was she born later biological dau. of Harry CLARKE? Or even step-dau of Jane?I cant find any trace of the marriage to Henry Clarke or his death.
In order to pinpoint when Jane & Harry might have married, this is the summary I can figure out,
using that online tree I mentioned (which includes 2 certs: Jane's 1st marriage, no ages on it + William Holmes death cert),
along with NSW BDM index & the information so far on this thread:
(Note #1: You might have to check or verify some references, given some info was from an online tree)
(Note #2: (Jane's age in square brackets at the beginning of each line))
[c. 0] 1837 - Jane Elizabeth WOOD born [Swan Hill WA]
[c.16] 1853 - (27th Dec) marries William HOLMES age c. 23 [Cumberland NSW]
* [c.17] 1854 - + Mary HOLMES [Tumut NSW]
[c.17] 1854 - + John HOLMES [Tumut NSW] (d.1874)
[c.22] 1859 - + William HOLMES [Tumut NSW] (d.1955)
[c.24] 1861 - + Elizabeth HOLMES [Tumut NSW]
[c.28] 1865 - + Edward "Ned" HOLMES [Adelong NSW]
[c.30] 1867 - + Ellen HOLMES [12 May 1867, Adelong NSW] - (m.TAYLOR) d. 21 Aug 1954 [Petersham NSW]
[c.33] 1870 - + Robert HOLMES [Tumut or Gundagai NSW]
[c.36] 1873 - + James HOLMES [Tumut or Gundagai NSW]
* [c.36] c.1873? - + Sarah CLARKE
[c.38] 1875 - (22 Oct) William HOLMES dies [Gundagai NSW] "5 Sons, 3 daus living"
* [c.39] 1876 - + Joseph HOLMES/CLARKE b. 24 Dec 1876 [Adaminaby NSW], d. 1963 [Batlow NSW]
* [c.39] 1876 - + Harry HOLMES/CLARKE [Adaminaby NSW]
[c.82] 1919 - (4 Dec) Jane Elizabeth CLARKE nee WOOD earlier HOLMES dies [Granya VIC]
age 95 "spent 8yrs in WA, 78yrs NSW, 9yrs in Victoria"
- this is where the 1824 birthyear came from