George had left Australia before his mother died in 1931.
Death
BARRETT Sarah Caroline 69 years Status Married Relative George BARRETT [Husband]
27 May 1931
Residence Bordertown Death Place Bordertown Rob 529/332
http://nla.gov.au/nla.news-article147326070The Naracoorte Herald 5 Jun 1931
MRS. GEORGE BARRETT.
Mrs. George Barrett, formerly a resident of Frances for many years, but for the past year
living at Border Town, died there on Thursday, May 28, after a long illness. Deceased was well known and widely esteemed here.Her genial manner and kind heart won her many friends. During war time she was an enthusiastic worker. A husband, three sons—Albert (Border Town), Lindsay (Frances),
George (India), and Stella (Mrs. McQueen, Border Town) survive. Her remains were interred at Frances on Friday, May 29, the Rev. E. H. Denning officiating at the graveside.
There is no headstone at Frances cemetery
http://www.ozburials.com/CemsSA/frances.htmhttp://nla.gov.au/nla.news-article92323881The Chronicle 30 May 1935
DEATHS
BARRETT At Wallaroo Hospital, on the 22nd May, 1935, George Barrett, formerly of
Frances, S.E., aged 74. At rest.
Interred in a unleased/public grave at Kadina Cemetery.
http://www.coppercoast.sa.gov.au/page.aspx?c=41204Cando