Hi - A double line means a separate household, but the same surname in the next entry often turns out to be an adult child or other relative (especially in a farming area).

Like Frances, and if Ann's age of 20 turned out to be correct, I thought she could be a child of William's from an earlier marriage - as could be the William nearby.

Can you find William Shand aged within a couple of years of 15 (which looks as though it was rounded) in 1851? A grandchild?

I don't know what "f.son” stands for in the 1851 census entry - can you email me the scan? Replace "at" with @. Sue"at"d2.net.au.
I'll see whether I can work out any of the words of which you were unsure.

Re. the butcher, I have come across farmers who were also recorded as butchers - it is a possibility for some period of his life.
Remember the death cert information wasn't given by the person himself, and some informants have only very vague memories of what they have been told. The marriage cert was usually far more reliable - do you have this?

When you go to Melbourne to the PRO you could look at the passenger lists for these entries to see where they came from:
[Unassisted inward passenger lists]:
Family Name First Name Age Month Year Ship Port Fiche Page:
BREMER, JOHN, 22, OCT, 1852, WILLIAM WALLACE, N, 001, 001
BREMER JOHN 19 MAY 1853 STRATHEDEN B 038 003
BREMNER ---- - OCT 1852 WANATA B 010 019
BREMNER JOHN 25 SEP 1857 ELLEN STUART B 131 001

Sue