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i am looking for anything about mary ann cook she is my gt gt grandmother what i have got at the moment is not alot i know she was born in liverpool about 1846 and she married my gt gt grandfather reuben moth in dudley staffordshire in 1870 don't know anything about her parents hope someone can help me thank-you lesley

You can get her Father's name from her marriage certificate, and need to do that for confirmation of any findings in censuses.

Marriages Sep 1870
Cook Mary Ann Dudley 6c 146
MOTH Reuben Dudley 6c 146

Added:
Mary (Ann) Cook* too common a name to find her conclusively without knowing her Father in Liverpool.
You can look for yourself in free bmd to see how many births there are around Liverpool.

Did you find this as appears to be under the name Smith in 1871, and Reuben's second marriage:
1871 England Census
Reuben Smith
Age: 33 Estimated Birth Year: abt 1838 Relation: Head Spouse's Name: Mary A Smith Gender: Male Where born: Frimley, Surrey, England Civil parish: Wednesbury Ecclesiastical parish: St Bartholomew
Town: Wednesbury County/Island: Staffordshire Country: England Registration district: West Bromwich Sub-registration district: Wednesbury ED, institution, or vessel: 9 Household schedule number: 152

Reuben Smith 33 Railway Wheel Smith's Striker
Mary A Smith 24 Liverpool
Rebecca Smith 10 Wednesbury Staffs
Lilas Smith 9
Shadrach Smith 7
Thomas Smith 3
John Smith 3

Source Citation: Class: RG10; Piece: 2988; Folio: 76; Page: 32; GSU roll: 838869.

1881 England Census about Mary Ann Moth
Name: Mary Ann Moth
Age: 35
Estimated Birth Year: abt 1846
Relation: Wife
Spouse's Name: Reubon Moth
Gender: Female
Where born: Liverpool, Lancashire, England
Civil parish: Wednesbury
County/Island: Staffordshire
Country: England
Street Address: 16 Meeling Street
Condition as to marriage: Married
Education:

Employment status:

View image
Registration district: West Bromwich
Sub-registration district: Wednesbury
ED, institution, or vessel: 15
Neighbors: View others on page
Household Members:
Name Age
Reubon Moth 44
Mary Ann Moth 35
Cyrus Moth 19
Shadrach Moth 17
Thomas Moth 15
Elizabeth Moth 9
Julia Moth 8
Lucy Moth 6
Hezekiah Moth 4
John H. Moth
Annie Spittle 16
Thomas Combs 23
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Original
Record

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There are several trees on ancestry, none give her parents

Mary Ann Moth

England and Wales Census, 1881
birth: 1846 — Liverpool, Lancashire, England
residence: Wednesbury, Stafford, England

record title: England and Wales Census, 1881
name: Mary Ann Moth
age: 35
gender: Female
birth year: 1846
birthplace: Liverpool, Lancashire, England
relationship to head of household: Wife
marital condition: Married
address: 16 Meeling Street
census place: Wednesbury, Stafford, England
record type: Household
family history library film: 1341684
the national archives reference: RG11
piece / folio: 2855 / 95
page number: 22

Mary Ann Cook

England Births and Christenings, 1538-1975
residence: Liverpool, Lancashire, England
parents: David Cook, Mary Ann Cook

record title: England Births and Christenings, 1538-1975
name: Mary Ann Cook
gender: Female
baptism/christening date: 25 Oct 1846
baptism/christening place: St Peter's Church, England, Lancashire, Liverpool
father's name: David Cook
mother's name: Mary Ann Cook
indexing project (batch) number: C04348-5
system origin: England-EASy
source film number: 1656425

David Cook

England and Wales Census, 1881
birth: 1827 — Liverpool
residence: Liverpool, Lancashire, England

record title: England and Wales Census, 1881
name: David Cook
age: 54
gender: Male
birth year: 1827
birthplace: Liverpool
relationship to head of household: Head
marital condition: Married
profession / occupation: Rigger
address: 1 Court Gt George Pl 2 House
census place: Liverpool, Lancashire, England
record type: Household
family history library film: 1341866
the national archives reference: RG11
piece / folio: 3617 / 103
page number: 9