I am trying to find the death of my 2 x great grandfather Thomas born in Urghart and Glenmoriston Inverness in 1806. He married Catherine Fraser around in 1829 and had 3 sons, Alexander, James and Simon. He then married Christina Grant in Urquhart in 1832 and had children (Catherine, Anne, Archibald, Elizabeth,Angus, Thomas, Flora).

Thomas and Christina and all Thomas' children excluding Alexander and Catherine migrated to Moreton Bay (Brisbane, Australia). Christina died in 1859 and Thomas married Johanna Donovan in Toowoomba in 1866. They had three children (Christiana, Jane and Archibald).

After 1871 Thomas, Johanna, Jane and Christiana all disappear along with Thomas and Christina's son Thomas and their daughter Annie Behan and her husband William.

I thought they might have moved to another Australian State, New Zealand, North America or back to Scotland but I can't find any of them. Can anyone help?