This is Birth Registration of Grace Amelia:
Name: Mother's Maiden Surname:
ADAMS, GRACE AMELIA JOHNSON
GRO Reference: 1903 J Quarter in PONTYPRIDD Volume 11A Page 696

This tells us that her Mother's Maiden name is Johnson.

This is the marriage of her parents:
Marriages Sep 1899
ADAMS Tom Hedley Pontypridd 11a 966
Johnson Sarah Florence Pontypridd 11a 966

Sarah died in 1911:
Deaths Jun 1911
Adams Sarah F 30 Pontypridd 11a 308

and Tom Hedley married again in 1914:
Marriages Mar 1914
ADAMS Tom H Webb Monmouth 11a 51
Webb Kate Adams Monmouth 11a 51

The marriage took place in Coleford Baptist Church and details can be found in the Parish Records on this site.

This is Tom and Kate in the 1939 Register:
The Moriners Shortstanding, Coleford, West Dean R.D., Gloucestershire, England
Adams household
(3 people)
First name(s) Last name(s) DOB Sex Occupation Marital status Schedule Schedule Sub Number
Tom Hedley Adams 19 Apr 1879 Male Colliery Pumpman Below Married 233 1
Kate Adams 30 May 1884 Female Unpaid Domestic Duties Married 233 2
Harriet Cooper 26 Mar 1878 Female Incapacitated Single 233 3

Kate died in 1948
Deaths Jun 1948
Adams Kate 63 F.of Dean 7b 323

Tom died in 1958:
Deaths Sep 1958
ADAMS Tom H 79 Gloucester R. 7b 385

Both are buried in the New Churchyard at Christchurch
ADAMS, Kate 1948 Apr 27 age 63
ADAMS, Tom Hedley 1958 Jul 19 age 79

This is Tom's birth registration:
ADAMS, TOM HEDLEY JONES
GRO Reference: 1879 J Quarter in MONMOUTH Volume 11A Page 28

His marriage to Kate Webb informs us that his father was William Adams.
This appears to be the marriage of his parents:
Groom Surname Groom Forename Bride Surname Bride Forename District Parish Building Year Register Entry
ADAMS William JONES Thirsa Forest of Dean Monmouth Register Office 1867 6 54

Here are entries from 1881 and 1891 Census:

1881 Census
Joyford Hill, West Dean (Gloucs), Monmouth, Gloucestershire, England
Household Members
Members that resided in the household at the time of the census.
First name(s) Last name Relationship Marital status Sex Age Birth year Occupation Birth place
William Adams Head Married Male 38 1843 Labourer At Stone Quarry Stretton, Herefordshire, England
Thirza Adams Wife Married Female 35 1846 - West Dean, Gloucestershire, England
William G Adams Son Single Male 12 1869 Scholar West Dean, Gloucestershire, England
James T Adams Son Single Male 10 1871 Scholar West Dean, Gloucestershire, England
Milbrough Adams Daughter Single Female 5 1876 Scholar West Dean, Gloucestershire, England
Frederick T Adams Son Single Male 6 1875 Scholar West Dean, Gloucestershire, England
Ada M Adams Daughter Single Female 5 1876 Scholar West Dean, Gloucestershire, England
Hedley T Adams Son Single Male 1 1880 - West Dean, Gloucestershire, England

1891 England, Wales & Scotland Census
Joyford, West Dean, Monmouth, Gloucestershire, England
Household Members
Members that resided in the household at the time of the census.
First name(s) Last name Relationship Marital status Sex Age Birth year Occupation Birth place
William Adams Head Married Male 48 1843 Quarryman Stone Stretton Grandison, Herefordshire, England
Thirza Adams Wife Married Female 46 1845 - Coleford, Gloucestershire, England
Milbrough Adams Daughter Single Male 18 1873 - West Dean, Gloucestershire, England
Frederick Adams Son Single Male 16 1875 Coal Miner West Dean, Gloucestershire, England
Hedley Adams Son - Male 11 1880 Scholar West Dean, Gloucestershire, England
Louisa Adams Daughter - Female 7 1884 Scholar West Dean, Gloucestershire, England
Frank Adams Son - Male 1 1890 - West Dean, Gloucestershire, England

Finally the marriage entry states:
"The groom is the second son and the bride the eldest daughter" whereas the 1881 Census tells us that he was the fourth son. However at the time of the marriage Tom Hedley was the Second Surviving son.

This is from a Memorial Inscription in Christchurch Churchyard:
"In loving memory of the children of William & Thirza Adams Edwin Charles died Feb 3 1878 aged 5 months Miriam Jane died Jan 22 1880 aged 9 months Louis Henry died Jan 9 1884 aged 16 months Mary Ada died Jan 19 1884 aged 8 years James John died Aug 3 1885 and William George died 15 Dec 1890 aged 22 years"

Mike