Hi Lea
I answered your message - and should have added - be wary if you think about buying the AVRI on places like ebay - they charge many times more than the cost sold by the LDS. What you need is a nice relative in UK or US to buy it.

It costs $US9 and about 7 pounds in the UK. The LDS cannot sell it in Australia nor post it to an Australian address.
These were the possible Tas marriages
Amelia Brooker m William Swan both listed with age A (Adult) 15 Mar 1870 Year 1870 Ref 351
David Morgan Brooker Aged 30 married Mary Ann Daly Aged 24 on 01 Oct 1880 Year 1880 Ref 740
George Brooker aged 25 married Eliza Mary Crosswell aged 16 on 19 Dec 1867 year 867 Ref 506
Matilda Brooker aged 20 married William Kingshot aged 23 on 19 Oct 1863 year 1863 ref 597
The ages seem about right. It seems strange that the children married in Tas yet there is no sign of the parents death. I wonder if they changed their name? Given the age of Mark, it seems unlikely he died after 1899 (end of early Tas records) but I can't find a death for him or his wife. Shall check a few more spelling variations.
Trish
Despite the early start of Tas registration, I have found, with my own family, quite a few missing registrations from the earlier years.