This is just me doing a recap. of the situation - mostly to see if I have everything straight!
We have James (or John!!!) on the Perseverance at the same time as a Catharine Rook (possibly born in Thorney Nottingham) - who may or may not be sister to the Cap't William Rook. 1811.
Was John a free man, and where did he come from?We have a birth in Sydney registered in 1811 for John and Catharine Macanally - son John.
We have John Macanally going off and on boats seeking seals during 1815-16 - or thereabouts.
We have Cap't William Rook dying of frostbite near NZ in 1825 and then coming alive again somewhere in 1826 - (haven't seen that reference yet!) Or were there two Cap'ts William Rook? I think someone mentioned him being a convict didn't they? If he was born 1785 that would make him about 40 - which is pretty reasonable I reckon.
Tried in 1788 - per Mathilda - same person as the Cap't??Question:Did marriages on ships get recorded? Could John and Catharine been married by Catharine's brother/father? If not, the baby in Sydney could have taken father's name anyway, and they may have lived as man and wife, much as Thomas and Catharine did.
OK??? so throw them all in together with three eggs and 2 cups of flour, bake 30 minutes, and what do we get?1. Mr and Mrs Macanally and son John coming to VDL in 1816 but we can't see how - swimming?


?? - we need Catharine in VDl by about 1817.
Is the father John Mc the same as the one on the sealing ship? - if so how did Catharine get to VDL and when?? 
or 2. is he James working for the Cummings? - in which case that is how Catharine got to VDL - with husband. That is almost the easiest to swallow.

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. . .And another critical search only slightly off topic - please can someone find the name of the ship on which Thomas Amos arrived in Australia in about 1816 - and did it call in at Port Dalrymple on the way to PJ?? I am hanging on the answer to this one!! I need it for my novella!
DO WE THINK that Catharine was in VDL by 1817? If she wasn't, where is Anne's birth registered - if at all? I'm going off looking for this again now!
This is all thinking aloud - so if I am off the mark, don't think anything of it!!
Cheers all,
Wiggy