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1883 Census gives the following:
Mrs. Brown age 36
John Brown age 15
Lillias Brown age 14
Elizabeth Brown age 12
James Brown age 10
Isabella Brown age 8
Maggi Brown age 6
William Brown age 4
Robert Brown age 3 (?)
Agnes Brown 4 mos

John Brown
Spouse Name: Isabella Sinclair
Marriage Date: 12 Oct 1866
Marriage Place: Queensland
Registration Place: Queensland
Registration Year: 1866
Registration number: 000664
Page Number: 1729

Australia Marriage Index, 1788-1950

Australia Birth Index, 1788-1922 about John Brown
Name: John Brown
Birth Date: 1861
Father's Name: John Brown
Mother's Name: Isabella
Birth Place: New South Wales
Registration Year: 1861
Registration Place: Kiama, New South Wales
Registration number: 8120

Australia Birth Index, 1788-1922 about Lillias Sinclair Brown
Name:
Lillias Sinclair Brown
Birth Date:
14 Dec 1868
Father's Name:
John Brown
Mother's Name:
Isabella Sinclair
Birth Place:
Queensland
Registration Year:
1869
Registration Place:
Queensland
Page Number:
1733
Registration number:
001596

Name: Elizabeth Brown
Birth Date: 11 Sep 1870
Father's Name: John Brown
Mother's Name: Isabella Sinclair
Birth Place: Queensland
Registration Year: 1870
Registration Place: Queensland
Page Number: 1699
Registration number: 002147

This census gives James as the older brother of the head of the household, who is Williasm S. Brown, born about 1878 in Washington. Their mother, Isabella, is living with them.

William S Brown
Gender: Male
Birth Date: 12 Nov 1878
Birth Place: Washington
Death Date: 11 Jun 1941
Death Place: Los Angeles
Mother's Maiden Name: Sinclair
Father's Surname: Brown

In this census Agnes is named "Addie" with birthdate of Sept 1882