Do you mean the 1911 entry for Cremmins Lane - parents John 60 & Catherine 55 - Hannah was 20
Her marriage cert to Andrew should give parental details
This IGI entry is for a 1879 birth so may not be her - just something to bear in mind perhaps
Hannah McNamara Birth: 27 MAY 1879 Cork, Cork Father: John McNamara Mother: Catherine Horgan McNamara