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- [S0462] Ancestry, South Africa, Church of the Province of South Africa, Parish Registers, 1801-2004, (ancestry.co.uk), 21 Oct 1917, Terence Patrick Requials John; (https://familysearch.org/ark:/61903/1:1:QVSH-FXYD : 16 August 2019), Charles Terence Edmond Hamilton O'Brien in entry for Terence Patrick Requials John, 21 Oct 1917; citing Baptism, Transvaal, South Africa, p. 141, W.
- [S0119] Ancestry, England & Wales, National Probate Calendar, 1858-1966, 1973-1995, (ancestry.com), 31 Jul 1945, Terence Patrick Reginald John O'Brien.
- [S0462] Ancestry, South Africa, Church of the Province of South Africa, Parish Registers, 1801-2004, (ancestry.co.uk), 27 Jul 1916, Charles Terence Edmund Hamilton O'Brien; (https://www.familysearch.org/ark:/61903/1:1:84QV-4VPZ : 12 July 2020), Charles Terence Edmund Hamilton O'Brien, 1916.
- [S0402] FamilySearch, India Marriages, 1792-1948, (familysearch.org), 7 Aug 1943, Terence Patrick Reginald John O'Brien; (https://familysearch.org/ark:/61903/1:1:HGGG-VP3Z : 5 February 2020), Terence Patrick Reginald John O'Brien, 1943.
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