Hi Denis. I to have relations in the NYC area. My ggggrandparents settled in the area of West 18th street and stayed there until my great aunt had to move in the 1960's. My ggggrandfather was Lawrence McDonough and his wife was Margareat Martin. Both were born in Ireland. He around 1830 and she around 1838. They had four children that I have been able to locate. My gggrandfather Tomas Francis born 1857; Mary Agnes born 1859, Cather born 1866 and another son Lawrence. My great grandfather married Anna Elizabeth Murray, they had six children: Margaret Mary born 1885; Thomas Francis born 1887; Lawrence born 1891; Francis born 1893; Isabel (my grandmother) born 1895 and Mary (Mae) born 1896.
You can contact me at Mamados48@aol.com
if any of this is familiar to you.