Hi,
Do you have Joseph's marriage cerificate showing his father was Joseph?
I have found the passenger list at
Voyage Arrival Date: 11 Dec 1838
Vessel Name: James Paterson
AUSTEN Joseph 22 Rolvenden Carpenter Protestant Reads & Writes
Sophia 26 Tenterden Housemaid " "
Lewis 3 " "
Also couldn't the Joseph death in 1890 be this son of Joseph and Sophia born...
Joseph AUSTEN
Birth Date: 1853
Father's Name: Joseph
Mother's Name: Sophia
Birth Place: New South Wales
Registration Place: Ni, New South Wales
Daisy