There was another TRIGG/JONES marriage as follows:

Marriages Sep 1908
JONES Sarah Jane Westbury S. 6a 608
TRIGG George Henry Westbury S. 6a 608

They were living in Nailbridge, Drybrook at time of the 1911 Census:
Name Relation to Head Birth Date Age Gender Marital Status Years Married Occupation Birth Place Address
George Trigg Head 1844 67 Male Married Coal Miner and Hewer East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
Rhoda Trigg Wife 1850 61 Female Married 41 Housewife East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
John Trigg Son 1876 35 Male Single Coal Miner and Hewer East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
George Henry Trigg Son 1871 40 Male Married Coal Miner and Hewer East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
Sarah Trigg Daughter-in-law 1881 30 Female Married 2 Housewife East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
Sidney Trigg Grandson 1910 1 Male East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire
Sarah Trigg Granddaughter 1911 0 Female East Dean, Gloucestershire George Trigg, Harry Hill, East Dean, Nailbridge, Drybrook, Gloucestershire

At that time there were 2 children but I have only been able to find a birth registration for Sidney:
TRIGG, SYDNEY GEORGE JONES
GRO Reference: 1909 D Quarter in WESTBURY-ON-SEVERN Volume 06A Page 259

He was buried at Drybrook on 25 August 1935 aged 25
______

Noting the place of residence of the two families may help in deciding who the parents were.

Lewis Flower and his wife Edith were living in Mitcheldean/Abenhall area, Lewis was buried at Abenhall.
We have transcripts of Abenhall marriages for a date later than we are able to publish at the moment but are able to say that Margaret Edith Mabel married Harold Edward George Meek at Abenhall on 21 December 1967. This records tells us that Margaret's father was Lewis.
George Henry and his wife Sarah were living in Drybrook area and I would suggest that Edith May, Hilda Florence, Frank and Ada Evelyn were their children as they all died very young and are buried at Drybrook.

Name: Mother's Maiden Surname:
TRIGG, EDITH MAY JONES
GRO Reference: 1913 M Quarter in WESTBURY ON SEVERN Volume 06A Page 500
Buried at Drybrook 18 March 1913 aged 5 days.

Name: Mother's Maiden Surname:
TRIGG, HILDA FLORENCE JONES
GRO Reference: 1916 D Quarter in WESTBURY ON SEVERN Volume 06A Page 434
Buried 23 Dec 1916 at Drybook. Aged 3 months.

Births Mar 1918
Trigg Frank Jones Westbury S. 6a 385
Buried at Drybrook 9 Jan 1918 aged 2 days

Births Sep 1920
Trigg Ada E Jones Westbury S. 6a 576
Buried at Drybrook 3 Feb 1921 Aged 6 months

This leaves Doris Ivy, Eric Wilfred and Eileen.

Name: Mother's Maiden Surname:
TRIGG, DORIS IVY JONES
GRO Reference: 1913 S Quarter in WESTBURY ON SEVERN Volume 06A Page 531

Married 1935
Groom Surname Groom Forename Bride Surname Bride Forename District Parish Building Year Register Entry
WYATT Arthur Joseph TRIGG Doris Ivy Forest of Dean Westbury-on-Severn (FoD) Register Office Closed 1935 22 94

1939 Register
2 Ashmead Road , East Dean R.D., Gloucestershire, England
FIRST NAME(S) LAST NAME(S) DOB SEX OCCUPATION MARITAL STATUS SCHEDULE SCHEDULE SUB NUMBER
Doris I Wyatt 15 Jun 1913 Female Unpaid Domestic Duties Married 133 2
Arthur J Wyatt 27 May 1913 Male Colliery Fireman Heavy Worker Married 133 1
____

Name: Mother's Maiden Surname:
TRIGG, ERIC WILFRED JONES
GRO Reference: 1915 J Quarter in WESTBURY ON SEVERN Volume 06A Page 490

Marriages Sep 1938
Stebbings Gwendoline C Trigg King's L. 4b 853
Trigg Eric W Stebbings King's L. 4b 853

Davies Household (4 People)
"the Bothy",Wavendon House , Newport Pagnell R.D., Buckinghamshire, England
FIRST NAME(S) LAST NAME(S) DOB SEX OCCUPATION MARITAL STATUS SCHEDULE SCHEDULE SUB NUMBER
Eric W Trigg 20 May 1915 Male Gardener (Private Employ) Married 239 4
Philip G Davies 10 Sep 1912 Male Gardener (Private Employ) Single 239 1
Douglas D Foord 22 Feb 1917 Male Gardener (Private Employ) Single 239 2
Charles T Strick 14 Feb 1917 Male Gardener (Private Employ) Single 239 3

Children:
Births Mar 1942
Trigg Brian E L Stebbings Gloucester R 6a 704
Births Sep 1943
Trigg Raymond R Stebbings King's L. 4b 372

Death of Eric:
Name: Eric Wilfred Trigg
Death Age: 76
Birth Date: 20 May 1915
Registration Date: Oct 1991
Registration district: Bristol
Inferred County: Avon
Volume: 22
Page: 625

Gillard Household (8 People)
3 Church Lane , King's Lynn M.B., Norfolk, England
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FIRST NAME(S) LAST NAME(S) DOB SEX OCCUPATION MARITAL STATUS SCHEDULE SCHEDULE SUB NUMBER
Gwendoline Trigg 16 Jan 1915 Female Unpaid Domestic Duties Married 56 3
George H Gillard 02 Feb 1895 Male Heavy Worker At Sugar Factory Labourer Married 56 1
Clara (V) Gillard 14 Feb 1892 Female Unpaid Domestic Duties Married 56 2
Cyril J Wells 03 Jun 1920 Male Lorry Driver Mak? Single 56 4
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Death of Gwendoline
Name: Gwendoline Clara Trigg
Death Age: 81
Birth Date: 16 Jan 1915
Registration Date: Jan 1996
Registration district: Bristol
Inferred County: Avon
Register Number: A27C
District and Subdistrict: 3011A
____________

Births Jun 1921
Trigg Eileen Jones Westbury S. 6a 579
Not found in any registers.

It is always dangerous to make assumptions and the only way to be absolutely certain of a family connection is to hopefully find transcripts of baptisms or marriages or obtain certificates. GRO is offering a PDF option for births up to 1917 and deaths up to 1957 at a cost of £6 each. The pdf option does not appear to be available for marriages.