| Sources |
- [S29] Ancestry.com, Web: Ireland, Census, 1911, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2013;), Class: RG14.
Record for Kathleen Grace O'Callaghan
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=70564&h=15613033&indiv=try
- [S30] Ancestry.com, Web: Ireland, Census, 1901, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2013;), Class: RG14.
Record for John O'Callaghan
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=70667&h=9812856&indiv=try
- [S29] Ancestry.com, Web: Ireland, Census, 1911, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2013;), Class: RG14.
Record for John O'Callaghan
https://search.ancestry.co.uk/cgi-bin/sse.dll?db=70564&h=14025834&indiv=try
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