Michael, I think this 1881 Census record should give you some information:
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Dwelling: 12 Tea St
Census Place: Prescot, Lancashire, England
Source: FHL Film 1341893 PRO Ref RG11 Piece 3729 Folio 6 Page 6
Marr Age ancestor_gender Birthplace
Peter CASLIN M 35 M Ireland
Rel: Head
Occ: Masons Lab
Mary CASLIN M 27 F Ireland
Rel: Wife
Thomas CASLIN U 9 M Prescot, Lancashire, England
Rel: Son
Occ: Scholar
Peter CASLIN 6 M Prescot, Lancashire, England
Rel: Son
Occ: Scholar
Mary CASLIN 3 F Prescot, Lancashire, England
Rel: Daur
Occ: Scholar
Maria May CASLIN W 60 F Ireland
Rel: Mother In Law
Occ: Nurse
Catherine CASLIN U 24 F Ireland
Rel: Sister In Law
Occ: Domestic Serv+++++++++++++++++++++++++++++++++