It looks like George's brother Alfred (aka Amos Alfred) died, unmarried, in 1916 in Iraq.
George's other brother Ernest William married Mary Ann Kate Brazier in 1918 and they appear to have had only one child, a daughter born in 1935 and baptised in Great Dunmow, who married in the Dunmow district in 1954. I couldn't find any children for the couple but her (possible) 1939 register record is still closed so she may still alive.
There is another George Henry Barrick born 1884 in Dunmow so are we absolutely sure that death in 1918 in Orsett is the correct George? If so, I'll try and locate the burial.
GRO BMD references:
1884 Q2 Marriage- Benjamin Barrick & Mary Ann Smith; Dunmow; 4a; 754
1916 Q1 Death - Benjamin Barrick; age 56 (born c1860); Dunmow; 4a; 990
1918 Q2 Marriage - Henry Tayler & Mary A Barrick; Dunmow; 4a; 1473
1885 Q1 Birth - George Henry Barrick (mmn: Smith); Dunmow; 4a; 605
1888 Q1 Birth - Amos Alfred Barrick (mmn: Smith); Dunmow; 4a; 619
1894 Q1 Birth - Ernest William Barrick (mmn: Smith); Dunmow; 4a; 698
1914 Q1 Marriage - George H Barrick & Ada F Clark; Dunmow; 4a; 1115
1918 Q2 Death - George Henry Barrick; age 33 (born c1885); Orsett; 4a; 554
1957 Q1 Death - Ada Frances Barrick; age 78 (born c1879; Thurrock; 04a; 815
1918 Q4 Marriage - Ernest W Barrick & Mary A K Brazier; Dunmow; 4a; 1745
1962 Q4 Death - Ernest W Barrick; age 69 (born c1893); Dunmow; 4a; 676
1976 Q1 Death - Mary Ann K Barrick; age 29 Mar 1895; Chelmsford; 9; 2087
George Henry BarrickBaptism:
name: George Henry Barrick
baptised: 12 Apr 1885; St Mary the Virgin, Great Dunmow
father: Benjamin, labourer
mother: Mary Ann
abode: Dunmow
born: 14 Feb 1885
Marriage:
married: 02 Feb 1914; St Mary the Virgin, Great Dunmow; banns
groom: George Henry Barrick; 28; bach; baker; All Saints Parish, Maldon
bride: Ada Frances Clark; 34; spin; -; North St, Great Dunmow
grooms father: Benjamin Barrick, labourer
brides father: James Clark (dec), licensed victualler
witnesses: Frederick William Smith, Blanche Mary Clark
Probate:
Ada Frances Barrick
of 19 Cheshnut-avenue Gray Essex
widow died 27 Mar 1957
Probate London 16 May
to Sydney Neal Banks solictor
Effects £1634 6s 10d
https://probatesearch.service.gov.uk/Calendar?surname=Barrick&yearOfDeath=1957#calendarElectoral registers:
1918 - Southend Road, Standford-le-Hope; Ada Frances Barrick
Parents: Benjamin Barrick and Mary Ann Smith:Baptism:
name: Benjamin Barrick
baptised: 11 Sep 1859; St Mary the Virgin, Great Dunmow
father: George, labourer
mother: Sarah
abode: Great Dunmow
Marriage:
married: 09 Jun 1884; St Mary the Virgin, Aythorpe Roding; banns
groom: Benjamin Barrack [signed Barrick]; 23; bach; labourer; Gt Dunmow
bride: Mary Ann Smith; 16; spin; servant; Ayethorpe Roding
grooms father: James Barrick, labourer
brides father: Henry Smith, labourer
witnesses: John Mason?, Elizabeth Mason
Burial:
name: Benjamin Barrick
buried: 23 Mar 1916; St Mary the Virgin, Great Dunmow
age: 56 years
abode: Church St, Dunmow
Re-Marriage:
married: 01 Apr 1918; St Mary the Virgin, Great Dunmow; banns
groom: Henry Tayler; 43; bach; labourer; Church End, Dunmow
bride: Mary Ann Barrick; 49; wid; - Church End, Dunmow
grooms father: James Tayler (dec), horsedealer
brides father: Henry Smith (dec), labourer
witnesses: S C Newell, Gladys Newell, William Robert Bowmes?
Brother: Amos Alfred BarrickDeath:
name: Alfred Barrick
born: 1887
age: 29
died: 31 Dec 1916
number 27486
rank: Gunner
https://www.cwgc.org/find-war-dead/casualty/1655348/barrick,-alfred/Alfred's attestation record names his next of kin as:
father Benjamin Barrick; Church Street, Dunmow
mother Mary Barrick; Church Street, Dunmow
elder brother George Barrick; baker; Rochford
younger brother Ernest Barrick; same address as parents
Brother: Ernest William BarrickBaptism:
name: Ernest William Barrick
baptised: 18 Feb 1894; St Mary the Virgin, Great Dunmow
father: Benjamin, labourer
mother: Mary Ann
abode: Church End
Marriage:
married: 19 Oct 1918; St Mary the Virgin, Great Dunmow; lic
groom: Ernest William Barrick; 24; bach; Private Kings Royal Rifles; Church End, Dunmow
bride: Mary Ann Kate Brazier; 23; spin; - Dunmow Vicarage
grooms father: Benjamin Barrick (dec), farm labourer
brides father: George Robert Brazier, labourer
witnesses: George Daniel Monk, Mary Ann Taylor, Gertrude House, Emily May Sewell
Administration:
Ernest William Barrick
of 6 Church Street Great Dunmow, Essex
died 27 Dec 1962
Administration London 29 Apr
to Mary Ann Kate Barrick widow
Effects £309 6s
https://probatesearch.service.gov.uk/Calendar?surname=Barrick&yearOfDeath=1963&page=1#calendarEDITS:
- Added marriage of Benjamin Barrick and Mary Ann Smith
- Added baptism of Benjamin Barrick
- Added probate of Ada Frances Barrick
- Added electoral register record for Ada Frances Barrick