John and Ellen Crow(e) (nee Mahoney) - any info appreciated

John and Ellen Crow(e) (nee Mahoney) are my 3rd great-grandparents, b. April 1846 and November 1849 respectively.  They married in 1867 and had their first child, Maurice (my uncle), 1868.  That same year, John emigrated to the US and Ellen and Maurice followed the following year. 

I received help from a couple of members here (in the General section) who found Maurice's birth record.  It shows place of birth as Knockmahon, but that is crossed out with Kilduane written underneath, which is also noted as the place of residence for John and Ellen.  The birth was registered in the District of Bonmahon, in the Union of Kilmacthomas.

Maurice's baptism (Roman Catholic) occurred in the Knockmahon Parish (if I understood the other member's posting correctly) with Patrick Mahoney and Brigid Crowe as informants, one member from both families.  I think Brigid (known as Bridget in the US) was born in December 1843, and think she may have been John's older sister or cousin.  She married John Mahoney/Mahaney, b 1839, in 1867.  I think John Mahoney may have been Ellen's older brother, cousin, or maybe even an uncle.  John and Bridget Mahoney (nee Crowe) are found in the 1880 US census with Morris (Maurice) as a boarder.

If anyone is able to help me pinpoint more information, such as the church in which Maurice was baptised, John and Ellen's parents' names, and if I'm lucky enough, maybe some of their descendants still living in the area, or anywhere in the country, for that matter, it would be greatly appreciated!