Jeanlitt/ Sparett
This is really weird.
The info you've given contradicts somewhat what l've got.
The convictions site

? the people in steerage would they be convicts ?
and Sparrett l have him having children in Vict with another woman.
I'll roughly give you what l've got. A bit of this is from family stories and fact
GGGMother Martha Jane Tyrer her parents where Williiam Henry Tyrer and a Mary Connelly. This is fact.
Family stories have it as her parents helped the Hentys bring cattle to Victoria and were the early pioneers in Port Fairy and Portland.
I have found the marriage of William and Mary in 1826 in Liverpool on the IGI.
Found the death index for Wm Tyrer in 1859 and has his birth place as Liverpool.
Going by what you've given me the Eliza going to TAS sounds right cause l know the Hentys also had land in Tassie and maybe he linked up with them there.
With him marrying in NSW

l don't know but what l fouind on that site was weird l have a William and Sarah Tyrer born to a Wm Tyrer and Mary Connolly in 1842 and 44 in Port Fairy respectively oiff the Victorian Birth Indexes ...and looking at NSW they have Wm and Sarah born to a Wm and Mary in 1842 & 44 which is really weird.
Advice would be helpful.
Zimmerman