Hi, Heather is not the only one who does free lookups.
South Australian BDMs are not online but can be found on CDs in many family history libraries.
I found just one sister of George Frederick Walton, and parent's marriage.
Groom: WALTON Frederick Robert Manchester; Age: 21; Father: George Thomas WALTON
Bride: DAHMES Florence Annie; Age: 22; Father: Garnet DAHMES
Date: 17.11.1923; Place: All Saints Church Hindmarsh
District: Hin / Book/Page: 297/544
WALTON George Frederick
Date: 4.7.1924
Father: Frederick Robert Manchester WALTON
Mother: Florence Annie DAHMES
Birth Place/Residence: Torrensville
District Code: Hin
Book: 137A / Page: 93
WALTON Ruth Lillian
Date: 24.10.1926
Father: Frederick Robert Manchester WALTON
Mother: Florence Annie DAHMES
Birth Place/Residence: Torrensville
District Code: Hin
Book: 181A / Page: 206
Frederick Robert Manchester WALTON was the son of George Thomas WALTON and Mary Ann nee BROWN.
Birth records have the following children for this couple.
1. WALTON George William John
Date: 20.9.1900
Birth Place/Residence: Ridleyton North
District Code: Hin
Book: 664 / Page: 157
2. WALTON Frederick Robert Manchester
Date: 24.4.1902
Birth Place/Residence: Hindmarsh
District Code: Hin
Book: 693 / Page: 34
3. WALTON Vera Elizabeth
Date: 4.4.1906
Birth Place/Residence: Henley Park
District Code: Hin
Book: 763 / Page: 323
4. WALTON Ruth Myra May
Date: 11.5.1907
Birth Place/Residence: West Thebarton
District Code: Hin
Book: 783 / Page: 284
5. WALTON Allan Frank
Date: 7.12.1909
Birth Place/Residence: Hindmarsh
District Code: Hin
Book: 834 / Page: 7
6. WALTON Raymond Alfred
Date: 18.9.1911
Birth Place/Residence: Welland
District Code: Hin
Book: 872 / Page: 380
7. WALTON Welland Albert
Date: 5.5.1913
Birth Place/Residence: Welland
District Code: Hin
Book: 909 / Page: 196
8. WALTON Cyril Belgium
Date: 20.6.1915
Birth Place/Residence: Welland
District Code: Hin
Book: 961 / Page: 38
WALTON Marriages:
Groom: WALTON George Thomas; Age: 23; Father: John WALTON
Bride: BROWN Mary Ann; Age: 19 Father: William John BROWN
Date: 30.4.1900; Place: All Saints Church Hindmarsh
District: Hin / Book/Page: 203/610
Groom: WALTON George William John
Bride: GRAY Nellie Evelyn Ernestina; Age: 18; Father: John Ernest Roger Hounslow GRAY
Date: 19.4.1924
Place: All Saints Church Hindmarsh
District: Hin; Book/Page: 299/268
Groom: WALTON Cyril Belgium
Bride: TAYLOR Constance Ethel; Age: 19; Father: John Henry TAYLOR
Date: 20.6.1933
Place: Church of Christ Hall Torrensville
District: Hin; Book/Page: 340/179
Groom: WALTON Raymond Alfred
Bride: BLACKWELL Phyllis Angeline; Age: 21; Father: Alfred Joseph BLACKWELL
Date: 26.3.1934
Place: Registry Office Adelaide
District: Ade; Book/Page: 346/866
Groom: WALTON Allan Frank
Bride: CURTIS Elsie Hilda; Age: 22; Father: Alexander CURTIS
Date: 29.1.1935
Place: Registry Office Adelaide
District: Ade; Book/Page: 354/283
Groom: WALTON Welland Albert
Bride: LAWRIE Stella Louisa; Age: 17; Father: Alick LAWRIE
Date: 18.5.1936
Place: Registry Office Adelaide
District: Ade; Book/Page: 368/2096
Groom: HENNING George Edward; Age: 21; Father: Charles Julius HENNING
Bride: WALTON Vera Elizabeth
Date: 30.8.1924
Place: All Saints Church Hindmarsh
District: Hin; Book/Page: 300/571
Groom: ATKINS Alexander Norman; Age: 25; Father: Alexander Edwin ATKINS
Bride: WALTON Ruth Myra May
Date: 18.10.1930
Place: All Saints Church Hindmarsh
District: Hin; Book/Page: 325/144
WALTON deaths:
WALTON Frederick Robert
Date: 2.1.1950
Age: 47y
Status: M
Relative: (not recorded)
Residence: Thebarton West
Death Place: Adelaide
District Code: Ade
Symbol: H
Book: 749 / Page: 171
WALTON George Thomas
Date: 1930-10-14
Sex: M
Age: 55y
Status: M
Relative: (not recorded)
Residence: Torrensville
Death Place: Torrensville
District Code: Hin
Book: 524 / Page: 253
Official assisted passenger lists, 1879, have this WALTON family. I suspect the George T is George Thomas, son of John WALTON.
The ship [79/4] Woodlark arrived 21 Feb 1879 Pt Adelaide
Surname Year First Name/List No
Walton 1879 Anne 79/4
Walton 1879 George T. 79/4
Walton 1879 Ruth 79/4
Walton 1879 Sarah 79/4
Walton 1879 Philip 79/7
Walton 1879 Mary A. 79/4
Walton 1879 John 79/4
Walton 1879 John J. 79/4
Walton 1879 Jesse 79/4
A John WALTON and Sarah nee SHILLINGFORD had one child born in SA I and think they are the above family. This couple married in the the third quarter of Jul 1869 at Winslow in Buckinghamshire aand a George Thomas WALTON was born in 1876 at Winslow.
SEE:
http://www.ancestry.com/search/This info may give you some leads for further research.
Rhonda