Good find by Debra! So this was his father's enlistment, from the NAA link. He had two sisters, possibly still living.
BAKER JOHN CYRIL : Service Number - 80322 : Date of birth - 03 Dec 1902 : Place of birth - LONDON ENGLAND : Place of enlistment - PERTH : Next of Kin - BAKER EILEEN
Here is their marriage:
Baker John C
district Geraldton
reg 10
year 1932
Hanlon Eileen M
They lived in Victoria Park and he died in 1968 aged 66. His wife's burial is as Ilene May BAKER, she lived to the age of 94 and died in 2006. They are both listed here as memorialised together at Karrakatta:
http://www2.mcb.wa.gov.au/NameSearch/search.phpHere is her birth:
HANLON ILENE M
Female
district GERALDTON
reg 102
year 1912
Likely parents for her are Richard James & Matilda Louisa Augusta (nee OKELY) who married in Geraldton in 1911 (reg 26).
Richard died young in 1928:
Tuesday 19 June 1928
HANLON.— At Perth, Richard HanIon, the beloved husband of Lillie HanIon and father of Eileen, Melva, Hazel, Edie and Connie; after a long and painful illness; aged 42.
HANLON. — On June 19, after long and painful illness, Richard ('Gug'), fifth son of Mrs. James Hanlon and brother of Herbert, Arthur, late Molly, Edith, Marge, Mabel, Robert and Charles, Wilfred; aged 42.
His parents were James & Elizabeth HANLON (nee PENNY), who also settled in the Geraldton area (married in WA in 1869, reg 2995). Richard was born in 1885 in Geraldton (reg as MANLON, reg 26389).
Matilda (known as LIllie) remarried after Richard's death to Isaiah BENNETT in 1932 (Geraldton, reg 16). She died in 1962 aged 65, daughter of Thos & Matilda (Perth, reg 1155). Probably her parents marriage in SA:
1882
131/119
OKELY Thomas Charles [d. 1909 WA]
SCHMIDT Matilda Louisa Augusta [d. 1941 SA]
Burra