Can see this family has a number of Public members trees on Ancestry

Thomas A's birth date is given as the 29 June - so Jeff's birth may be the correct one i.e.

Name: Thomas Peter DENAHAY (Daniel's father's name given as Thomas on D's death certificate, on Public members tree)

Date of Reg: July/Aug/Sept 1884

Reg District: Newport

Inferred County: Monmouthshire

Volume: 11a

Page: 194

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1881 Wales Census, Cardiff, St John -- 20 Sandon Place, Glamorgan - Cardiff, Monmouthshire

John DALEY - 56 - Coal Keeper ??? - born Ireland, Cork
Mary DALEY - 53
John DALEY - 26
Thomas DALEY - 17
Margaret DALEY - 13
Mary O'BRIEN - 40
Daniel DUMEY - 21 - labourer, born Ireland, Cork
John O'Sullivan - 26
Ellen SUTTON - 45
Catherine WALSH - 28
Jermemiah DALEY - 40
Ellen DALEY - 40

1881 Wales Census, Cardiff St John - 20 Park Place

working for Thomas U H PLAIN - Shipbuilder

Ellen Oconnor - 26 - General Servant, born Cork Ireland

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Ancestry (Marriage)

Name: Daniel DENERY

Date of Registration: April/May/June 1883

Reg. District: Newport

Inferred County: Monmouthshire

Volume Number: 11a

Page Number: 300