From GFHS Marriage Index:

11 October 1835 Thomas MORGAN of Hundred of St Briavels married Mary Ann WOOD of Hundred of St Briavels by Banns at Abenhall

1851 Census:
1959 0313 021 Bradley Hill MORGAN Thomas HD M 35 Quarryman GLS East Dean
1959 0313 021 Bradley Hill MORGAN Mary WI M 30 - GLS East Dean
1959 0313 021 Bradley Hill MORGAN Joseph SO - 14 Quarryman GLS East Dean
1959 0313 021 Bradley Hill MORGAN Thomas SO - 11 Quarryman GLS East Dean
1959 0313 021 Bradley Hill MORGAN George SO - 7 - (Deaf & Dumb) GLS East Dean
1959 0313 021 Bradley Hill MORGAN William SO - 4 - GLS East Dean
1959 0313 021 Bradley Hill MORGAN John SO - 10M - GLS East Dean

Next household and possible parents:
1959 0313 022 Bradley Hill MORGAN Thomas HD M 59 Quarryman GLS Awre
1959 0313 022 Bradley Hill MORGAN Elizabeth WI M 83 - MON Tintern Abbey
1959 0313 022 Bradley Hill MORGAN George HD M 33 Quarryman GLS East Dean
1959 0313 022 Bradley Hill MORGAN Mary WI M 26 - GLS Awre
1959 0313 022 Bradley Hill MORGAN James SO - 2M - GLS East Dean

Joseph's brother Thomas was baptised at Newnham:

Entry Number: 43
Year: 1839
Month: Jun
Day: 23
Parents Surname: MORGAN
Child's Forenames: Thomas
Father's Forenames: Thomas
Mother's Forename: Mary Ann
Mother's Surname (if different):
Place of Residence: Hundred of St Briavels
Occupation Labourer
Minister: J Parsons
Type of Event: C
Memoranda:
Notes:
Register Ref: P228 IN 1/9
Page Number: 6
Parish: Newnham

Suggest you look there.

Mike