As my access to Scottish web records are quite limited from here in Australia
You have, in fact, exactly the same online access to the basic documents as anyone living in Scotland.
See
http://www.rootschat.com/forum/index.php?topic=714261.0I see from 'community indexed' IGI at
www.familysearch.org that Alexander Angus and Jane Jessamin were married in 1820 and had three recorded children
Isobel, baptised 11 December 1820 in Huntly
Ann Catharine, baptised 25 August 1823 in Huntly
James, born 11 and baptised 19 June 1827 in Mortlach
It is possible that there could be other children whose baptism records have not survived; in particular there is a gap in 1825 when another child might have been born.
The 1841 census transcription at
http://www.freecen.org.uk/cgi/search.pl lists in Huntly Alexr Angus, 50; Jane Angus, 44; James Angus, 14; John Angus, 55. In 1851 there are Alexander Angus, 61, born Huntly; Jane Angus, 54, born Huntly; James Angus, 23, born Mortlach.
If these ages are accurate, Alexander would have been born 1789/1790 and Jane in 1796/1797.
The index at Scotland's People lists the death of Alexander Angus, aged 85, in Huntly in 1872, and Jane Jessiman or Angus, aged 79, in Huntly in 1877. So your first step is to register with Scotland's People, invest in at least 12 credits at less than the cost of buying a single Australian certificate, and use them to view and download both death certificates. They will tell you the names of both parents of both Alexander and Jane, including their mothers' maiden surnames.
There is a 20-year-old Isobel Angus, servant in a household in Huntly, in the 1841 census. I have not found her in 1851, so she probably married between 1841 and 1851.
There are quite a lot of Ann Anguses in the 1841, but again I have not found a likely-looking one in 1851, so the chances are that either she died before 1841, or that she married between 1841 and 1851.
If either Isobel or Ann Catharine died in Scotland after 1855, there should be a death certificate.
Hope this helps.