Well James once again had the family story incorrect. Sarah returned to Scotland before 1867

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1861 Census Parish Perth Burgh 39/3/2
Living at 23 Commercial Street, Perth Burgh Perthshire
McINTOSH Sarah Head 30 years Seamans Wife Chief Mate Born Dundee Forfarshire
McINTOSH Agnes Dau 8 years Scholar Born Australia
McINTOSH Charles J Son 6 years Scholar Born Australia
McINTOSH James H Son 4 years Born Australia
McINTOSH Alexander A Son 4 months Born Kinnoull, Perthshire
ARCHIBALD Georgine Boarder 24 years Cloth Presser Born Perthshire
1871 Scottish Census Parish Dundee 2/15/7
Living 89 Nethergate Street, Dundee
McINTOSH Sarah Head 41 years Annuitant Born Dundee Forfarshire
McINTOSH Agnes Dau 18 years Tailoress Born Richmond, Australia
McINTOSH Charles F [error] Son 16 years Apprentice Engineer Born Richmond, Australia
McINTOSH James H Son 13 years Message Boy Born Amherst, Australia
1881 Scottish Census Monifeith 5/3/13
Living at 55 Cowans Cottages, Monifeith Angus
McINTOSH Sarah H Head 52 years Born Dundee Forfarshire
McINTOSH Charles Son 26 years Marine Engineer Born Victoria
McINTOSH James H Son 24 years Seaman M S Born Victoria
GRAY Agnes McIntosh Dau 28 years Wife of a seaman Born Victoria
GRAY Alexander McIntosh Grandson 9 years Scholar [Mother Agnes Mcintosh GRAY] Born Dundee, Forfarshire
GRAY Sarah Mina Granddaughter 7 years Scholar [Mother Agnes Mcintosh GRAY] Born Dundee Forfarshire
GRAY Roderick Grandson 5 years Scholar [Mother Agnes Mcintosh GRAY] Born Dundee Forfarshire
GRAY Christina Granddaughter 1 years Scholar [Mother Agnes Mcintosh GRAY] Born Dundee Forfarshire
Now all you need is Alexander's 1871 death cert. I notice that Sarah was 41years in the 1871 census and Alexander who died in 1871 aged 44 years is surely her husband. Unfortunately IF he did die in a public institution there is usually little information on the death certificate.
The Scottish Census was taken on 2/3 April 1871 and with Sarah describing herself as an annuitant, I now wonder when in 1871 did Alexander die?
There is an inquest file at the Public Records of Victoria however they do not offer a copy service.
I now wonder why the story was so incorrect.
James H's sister and brother were not born at sea but in Richmond, Victoria, Australia.
Was Sarah hiding something about their life, and Alexander's death, in Australia.
Cheers
Cando