You told me George and Eliza Douglas, from Ireland, had 3 children before setting off to Australia. You thought that you had them coming into Melbourne on the Brig of Hamburgh, Reibersteig 10 September 1852. I think the the name of that brig might be the 'Reiherstieg' of Hamburg (i.e. not Brig of Hamburgh). Apart from the two named cabin passengers, there were 56 men and 41 women (no mention of children).
The more information you can give about the people you mention, the more chance there is of someone else connecting with your family.
Dates and places of births, deaths and marriages all help to place families.
Professions also help.
'My great-grandmother mother was a Douglas from Montrose' does not give many clues to follow up! But a bit of flesh on the bones makes further research possible. But if we are told who she married, what his profession was and where the children were baptised, then we can get to work.
Maybe it is time to update the information in your profile?