per father’s DC#WDXZ091972
present at fathers death in 1879, reported death 22 dec 1879

POSS GRO Birth
JENKINS, JOHN COOK Order
GRO Reference: 1845 M Quarter in NEWPORT Volume 26 Page 106

1851UKC Jacob Jenkins & family; Wales > Monmouthshire > Mynyddyslwyn > District 3c; Penmaen, Monmouth; image 28 of 40 @ancestry.com; Source information: HO107/2453; Registration district: Newport; Sub-registration district: St Woollos; ED, institution, or vessel: 3c; Folio: 445; Page: 30; Household schedule number: 98; GSU Number: 104194; “Crumlin”

1861UKC Jacob Jenkins & Fam; Wales Census > Monmouthshire > Mynyddyslwyn > District 6; image 10 of 39 @ancestry.com - no Mercy wife listed but 1st 3 children same as on 1851 sample
Jacob Jenkins, HOH, b. 1820 in Mynyddyslwyn, Monmouthshire, Wales
John Jenkins, Son, b. 1845 in Mynyddyslwyn, Monmouthshire, Wales
Martha Jenkins, Daughter, b. 1848, in Mynyddyslwyn, Monmouthshire, Wales
Margret Jenkins, Daughter, b. 1851 in Mynyddyslwyn, Monmouthshire, Wales
Mercy Jenkins, Daughter, b. 1853 in Mynyddyslwyn, Monmouthshire, Wales
Harriet Jenkins, Daughter, b. 1856 in Mynyddyslwyn, Monmouthshire, Wales

1871UKC Jacob Jenkins and Family; Wales, Monmouthshire > Mynyddislwyn > District 6 > 29; image 29 of 46 @ancestry.com; Source Citation: Piece: 5352; Folio: 134; Page: 29; .
Crumlin NDN JohnJenkinsFam
Jacob Jenkins 59
Mercy Jenkins 50
Thomas Jenkins 10
Jacob Jenkins 7
David Rossant 21 lodger
John Sowden 41 lodger
NDN John Jenkins 26
Margaret wife 22
Elizabeth daur 1yr

POSS Death
FreeBMD Deaths Dec 1880
Jenkins John; dist Newport M.; vol 11a; pg 127
The district Newport M. is an alternative name for Newport M and it spans the boundaries of the counties of Glamorgan, Gwent and Monmouthshire and information about it can be found here.