1851 Census, Somerset, Lansdown, District 1B Page 14
9 Queens Parade

Martha COX - age 52, unmarried - Serv. born Lydney

1861 Census, Somerset, Walcot, Trinity
District 8
Page 4
6 Albion Place (Green Shop)

Martha COX, age 62 Lodger, unmarried, Retired Servant

Thanks for your interest,so John is the son of John & Martha thanks for that, I think that Harriet 1820 died as an infant.

From this site

Record_ID: 24484
Entry_Number: 276
Year: 1821
Month: Aug
Day: 14
Surname: COX
Forenames: Harriet
Residence: Lidney
Age_at_death: 10 M[on]ths
Officiating_Minister: W[illia]m. Jones
Event: Burial
Cause_of_death:
Memoranda:
Notes:
Register_Reference: P209 IN 1/11
Page_No: 35
Parish_Chapel: Lydney
Soundex: C200

Regards

David

Thomas 1815
Harriet 1820
Sarah 1823
Eliza 1825
John 1826
Sally 1828
James 1830
Charlotte 1836 : christened 1836 - Newarne

I think this is the family on the 1841 census for Lydney (Newarne)

John COX - 55
Sally - 55
Sally - 13 (c1828)
James - 8 (c1830)
Charlot - 5 (c1836)

Just above John COX is Mary COX - 20

John COX baptised in Lydney 1790- parents John & Martha

John c1826 is on the 1841 census in Lydney (labourer) with Martha COX age 70 (his possible grandmother)

1851 Census Lydney

Same COX family, all born Lydney

John - 60
Sally - 60 (who appears to be called Sarah on the children's baptisms)
John - 24
James - 21
Charlotte - 15

(if you use the Advanced Search) - you will find a John COX (residence Newherne) and Harriet HOWARD (is she Harriet Cox c1820) witnesses at the marriage of William COX - (father John COX) to Caroline WARREN - 18 March 1852)

From this site I have found 8 children between 1815 - 1836.

Thanks

David