O'Kelly's parents' marriage registration in 1879 - they had not yet reverted to the Irish form of their names as O'Kelly and O'Dea, but still used 'Kelly' and 'Dea', a custom dating back to when surnames beginning with 'Mac' or 'O' were forbidden entry to Dublin; they were both living in 7 Fishamble Street, a tenement by Christ Church Cathedral that is one of Dublin City's most ancient streets. He is a boot maker and she is a basket maker https://civilrecords.irishgenealogy.ie/churchrecords/images/marriage_returns/marriages_1879/11067/8049223.pdf
Kelly, Hogan and Whyte The Irish Constitution (4th ed., LexisNexis Butterworth, 2003) par 4.5.110. Health Act, 1947 Part III "Health Act, 1947". Archived from the original on 3 May 2006. Retrieved 17 May 2006..
Kelly, Hogan and Whyte The Irish Constitution (4th ed., LexisNexis Butterworth, 2003) par 4.5.110. Health Act, 1947 Part III "Health Act, 1947". Archived from the original on 3 May 2006. Retrieved 17 May 2006..