There was a George Allen living at 6 Sullivan Avenue in Wagga in 1968 with a Maud Allen. What exactly are you looking for and do you have any other identifying information?

George Allen has a son named Leslie Allen

Here's a few leads;

Daily Advertiser (Wagga Wagga, NSW) Monday 13 December 1954
FUNERAL
Mr. G. Allen
The death occurred in the Wagga Base Hospital on
Friday evening of Mr. George Allen, of 104 Morgan Street,
Wagga, at the age of 63 years.
The late Mr. Allen had resided all his life in
the Wagga and Ganmain districts. He is survived by
three sons, Messrs. Leslie Allen of Sydney, Stanley
James and John Clifford Allen of Albury, and two
daughters, Daphne (Mrs. G. Williams) of Albury and
Dorothy (Mrs. N. Williams) of Albury. He was a member
of the Wagga Old Age and Invalid Pensioners' Association.
His funeral took place in Wagga on Sunday afternoon,
the cortege leaving St.John's Church of England, Wagga,
after a service conducted by Rev. J. F. Hannam, of Wagga.
Relatives and friends Joined in the singing
of 'Abide With Me.'
Interment took place in the Wagga Cemetery, where Rev.
Hannam officiated at the graveside. Relatives and
friends were present from Albury, Wodonga. Wagga and
Ganmain.
Many beautiful floral tributes were received.
Funeral arrangements were conducted by J. C. McDonald, of Wagga.

I am looking for information on Leslie James Allen born in Wagga Wagga his father is George Allen from Wagga Wagga and his mother is Kathleen Arnold (Allen) her last known address is in Leichhardt Sydney