Hi Carol,
I think Aubrey Wilkins must have been born after 1900 as he doesn't appear on the 1901 census.
Wilkins living in Blackthorn in 1901 are:
Household 1
William Wilkins 60 Oxon Blackthorn Oxon Blackthorn Cattleman On Farm
Rebecca Wilkins 61 Oxon Hethe Oxon Blackthorn
Albert Wilkins 34 Oxon Blackthorn Oxon Blackthorn Agricultural Labourer
Amos Wilkins 20 Oxon Blackthorn Oxon Blackthorn Shepherd On Farm
George Wilkins 27 Oxon Blackthorn Oxon Blackthorn Agricultural Labourer
Herbert Wilkins 23 Oxon Blackthorn Oxon Blackthorn Agricultural Labourer
Alice Wilkins 3 Oxon Blackthorn Oxon Blackthorn
Emily Wilkins 16 Oxon Blackthorn Oxon Blackthorn
Rebecca Wilkins 61 Oxon Hethe Oxon Blackthorn
Household 2
Hannah Wilkins 75 Oxon Arncott Oxon Blackthorn
Charles Wilkins 31 Oxon Blackthorn Oxon Blackthorn Farmer
James Wilkins 68 Oxon Blackthorn Oxon Blackthorn Cattle Man
John Wilkins 65 Oxon Blackthorn Oxon Blackthorn Farm Labourer
Robert Wilkins 24 Oxon Blackthorn Oxon Blackthorn Farm Labourer
Household 3
Jane Wilkins 79 Oxon Woodstock Oxon Blackthorn
I would guess that Aubrey may have the same father as Alice age 3 and that it is probably one of Williams sons who was married and living at home (his wife was maybe away for the census?)
I checked on the 1881 census to check that the younger Wilkins were sons of William and not just living in the same house as labourers. These are the Wilkins familys from the 1901 census in 1881:
household 1
William WILKINS M Male 40 Blackthorn, Oxford, England Ag Lab
Rebecca WILKINS M Female 40 Heathe, Oxford, England
Albert WILKINS U Male 14 Blackthorn, Oxford, England Ag Lab
George E. WILKINS Male 7 Blackthorn, Oxford, England Scholar
Frederick WILKINS Male 5 Blackthorn, Oxford, England Scholar
Herbert WILKINS Male 3 Blackthorn, Oxford, England Scholar
Rosina WILKINS Female 3 m Blackthorn, Oxford, England
Amos WILKINS Male 3 m Blackthorn, Oxford, England
Source Information:
Census Place Ambrosden, Oxford, England
Family History Library Film 1341364
Public Records Office Reference RG11
Piece / Folio 1507 / 25
Page Number 3
household 2
Charles Wilkins abt 1870 Blackthorn, Oxfordshire, England Son Ambrosden
Henry Wilkins abt 1875 Blackthorn, Oxfordshire, England Son Ambrosden
James Wilkins abt 1836 Blackthorn, Oxfordshire, England Head Ambrosden
Joanah Wilkins abt 1841 Hardwick, Oxfordshire, England Wife Ambrosden
Kate Wilkins abt 1878 Blackthorn, Oxfordshire, England Daughter Ambrosden
household 3
John Wilkins abt 1836 Blackthorn, Oxfordshire, England Head Ambrosden
John Wilkins abt 1864 Blackthorn, Oxfordshire, England Son Ambrosden
Mary Wilkins abt 1839 Blackthorn, Oxfordshire, England Wife Ambrosden
Mary Wilkins abt 1878 Blackthorn, Oxfordshire, England Daughter Ambrosden
Robert Wilkins abt 1876 Blackthorn, Oxfordshire, England Son Ambrosden
Sarah Wilkins abt 1873 Blackthorn, Oxfordshire, England Son Ambrosden
household 4
Arthur Wilkins abt 1872 Blackthorn, Oxfordshire, England Grandson Ambrosden
Emily Wilkins abt 1816 Fencott, Oxfordshire, England Head Ambrosden
household 5
Jane Wilkins abt 1823 Old Woodstock, Oxfordshire, England Wife Ambrosden
Thomas Wilkins abt 1824 Blackthorn, Oxfordshire, England Head Ambrosden
There were a few other Wilkins in the same area you can check them on the LDS site:
http://www.familysearch.orgI had a quick look on the freeBMD site for the birth of Aubrey but didn't find it, but it is of course work-in-progress.
http://freebmd.rootsweb.comHope this is some help,
Regards,
Emily