second suspect

1901 Census gives Charlotte's place of birth as Shortstanding and her age as 35.
This is the Household:
Albert Watkins abt 1900 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire
Charlotte Watkins abt 1866 Short Standing, Gloucestershire, England Wife West Dean, Monmouthshire
Enock Watkins abt 1860 Lydbrook, Gloucestershire, England Head West Dean, Monmouthshire
George Watkins abt 1895 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire
Harry Watkins abt 1897 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire
Howard Watkins abt 1888 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire
Maud Watkins abt 1885 Lydbrook, Gloucestershire, England Daughter West Dean, Monmouthshire
Melcom Watkins abt 1893 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire
Wyndam L Watkins abt 1899 Lydbrook, Gloucestershire, England Son West Dean, Monmouthshire

We have this baptism:
Year: 1864
Month: Dec
Day: 8
Parents Surname: JONES
Child Forenames: Charlotte
Father's Forenames: Benjamin
Mother's Forenames: Caroline
Mother's Surname:
Place of Residence: Shortstanding
Occupation: Collier
Officiating Minister: W.H. Taylor
Event type: Baptism
Memoranda:
Notes:
Register Reference: PFC82 IN 1/4
Page No: 8
Parish_Chapel: Christchurch

Marriage took place in September Quarter 1891.

Marriages Sep 1891
Jones Charlotte Monmouth 11a 64
Watkins Enoch Monmouth 11a 64

1881 Census:
Anna Jones abt 1872 West Dean, Gloucestershire, England Daughter West Dean, Gloucestershire
Benjamin Jones abt 1823 Monmouth, Wales Head West Dean, Gloucestershire
Caroline Jones abt 1831 West Dean, Gloucestershire, England Wife West Dean, Gloucestershire
Charlotte Jones abt 1864 West Dean, Gloucestershire, England Daughter West Dean, Gloucestershire
George Jones abt 1861 West Dean, Gloucestershire, England Son West Dean, Gloucestershire
Henry Jones abt 1867 West Dean, Gloucestershire, England Son West Dean, Gloucestershire

Possible 1891 Census:
Charlotte Jones abt 1866 Newland, Gloucestershire, England Servant St Marylebone, London

Charlotte's father, Benjamin died in 1885.

In 1891 Caroline Jones, mother is living in Camomile Green, Lydbrook. Just a few doors away is this household:
Enoch Watkins abt 1859 Upper Lybroch Head West Dean, Gloucestershire
Howard Watkins abt 1887 Upper Lydbrook Son West Dean, Gloucestershire
Mary Watkins abt 1833 Upper Lybroch Mother West Dean, Gloucestershire
Maud M Watkins abt 1885 Upper Lybroch Daughter West Dean, Gloucestershire
Reuben Watkins abt 1874 Upper Lydbrook Brother West Dean, Gloucestershire

Mike

1851 Census (GFHS transcription):
Piece Folio SchNo Town Surname Forename Relatn Marr Age Occupation County Place
2444 0319 114 West Dean JONES Benjeman HD M 28 Collier [MON] Monmouth
2444 0320 114 West Dean JONES Cariline WI M 23 - GLS Newland
2444 0320 114 West Dean JONES Thomas SO U 3 - GLS West Dean
2444 0320 114 West Dean JONES James SO - 3M - GLS West Dean

Marriage:
Year: 1845
Month: Dec
Day: 25
Groom Surname: JONES
Groom Forenames: Benjamin
Groom Age at Marriage: 23
Groom condition: Bachelor
Groom Rank or Profession: Collier
Groom Residence: Christchurch
Groom Father's Surname: Jones
Groom Father's Forenames: Thomas
Groom Father's Rank or Profession: Labourer
Bride Surname: TYLER
Bride Forenames: Caroline
Bride Age at Marriage: 18
Bride Condition: Spinster
Bride Rank or Profession: [not stated]
Bride Residence: Christchurch
Bride Father's Surname: Powell
Bride Father's Forenames: James
Bride Father's Rank or Profession: Collier
Licence or Banns: [not stated]
Date of banns:
Signature or Mark: He marks she signs
Witness 1: Thomas Gwillam
Witness 2: Selina Nelmes
Other witnesses: None
Officiating Minister: Tho. R. Garnsey
Event type: Marriage
Memoranda: -
Transcriber's Notes: -
Register Reference: PFC82 IN 1/7
Page No: 6
Parish_Chapel: Christchurch

Possible baptism:
Year: 1825
Month: Jan
Day: 2
Parents Surname: JONES
Child Forenames: Benjamin
Father's Forenames: [not stated]
Mother's Forenames: Sarah
Mother's Surname:
Place of Residence: Joyford
Occupation: [not stated]
Officiating Minister: T.R. Garnsey Incumbent
Event type: Baptism
Memoranda: Illegitimate son of
Notes:
Register Reference: P82 IN 1/1
Page No: 40
Parish_Chapel: Christchurch

Mike

The 2nd suspect seems most likely as the marriage at Monmouth, Sept. 1891 fits in between the death of Enoch Watkins' 1st wife Harriet Parry in March 1891 and the birth of Malcom Watkins to Charlotte in 1892.
Siblings Thomas and Edward Watkins (1861 census) are remembered by my mother who also recalls that Edward Jones was awarded the George Cross after the battle of Reurks Drift. In later life Edward (Ted) lived more peacefully at Quay Row, Lower Lydbrook.
Many thanks for such a helpful response.