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Henry NANKIVELL (miller) was previously married to Lucy SYMONS (13 June 1806 at St Symphorian Veryan, Cornwall)
I can't fine a death for her presumably sometime between 1820 (the last baptism of a child of the parents Henry and Lucy - if that makes sense  ) and 1834, but assume it's the same Henry. They had various children whose baptisms (and some deaths) you can see on familysearch or FreeReg.  William Henry born 1840 appears to be the only child of Henry and Philippa.

I think Henry died aged 86 in 1862, buried 21 Sep 1862 at St Rumon, Ruan Lanihorne. and Philippa buried on 8 Jun 1875, aged 78 at the same place.

From information provided by dathai in your previous post, it seems that Horace Victor's parents were Horace Dillon NANKIVELL and Florence Kate MORRIS. They are easy to follow through the censuses free to search on familysearch. 

Horace Dillon NANKIVELL born 29 October 1877, bap 12 April 1880 at East Dereham, Norfolk, to parents William Henry NANKIVELL and Emily HARDIE/Y.

William Henry NANKIVELL born c1840 Cornelly, Cornwall.
[possibly William Henry NANKIVELL Jun qte Truro (9/321), mother's maiden name DILLON]
Emily HARDY born c1846 Cambridge (according to the 1881 census)
[possibly Emily HARDY Dec qtr 1845 Cambridge (14/10) mother's maiden name WILDERSPIN]

Modified to add:
Horace Dillon NANKIVELL married Florence Kate MORRIS Dec qtr 1905 Ticehurst (2b/259)

William H NANKIVELL married Emilie HARDY Mar qtr 1866 Cambridge (3b/587)

Have you seen this obit from Melbourne Lorgnette?
http://nla.gov.au/nla.news-article208482276

Looking for a marriage in Oz, but difficult with so many pseudonyms.

Modified to add: There are many articles about the couple in the Australian newspapers of the time, free to view on Trove. https://trove.nla.gov.au/

Speculation again, but there is a death for a 40 year old Catherine AUSTEN in Sept qtr 1837 registered at Romney Marsh, which includes Burmarsh.

There are then around 20 marriages for a John AUSTI/EN between Sept 1837 and Jun 1839. If you could identify any later children born in England (the passenger list says 8 children), you should be able to find out the mother's maiden name on the GRO birth index.

Modified to add: On familysearch there is a burial for Catherine AUSTEN 8 Aug 1837, aged 41 at Burmarsh.

Oh yes, that's what I was thinking, but my fingers typed something different.