This is the marriage of Martin Finan and Mary FarrellKilkeevin (Castlerea) June 22nd 1863https://registers.nli.ie/registers/vtls000633929?locale=en#page/55/mode/1up
Robert, Do you know that Mary Anne survived and married?There are deaths in Drogheda here https://www.irishgenealogy.ie/en/ but too early for online.1864 - Mary Anne Farrell, 20 yrs1865 Mary Farrell, 21 yrs1865 Mary Farrell 19 yrsWho is Anne Farrell, the informant at Peter's deathhttps://civilrecords.irishgenealogy.ie/churchrecords/images/deaths_returns/deaths_1879/06528/4881193.pdf
Which Farrell son was your great great grandfather?