John L. McMahon married Anne Quinlan 1848

I've hit a brick wall in my search for my ancestors. What  I have so far is as follows:

John L. McMahon  B: 1822 Co Clare Ireland  D: 11-22-1897 Grand Forks, North Dakota USA

1848 M: Anne Quinlan  B: 1831 in either Clare or Tipperary  D: 6-10-1885 Grand Forks, N.Dak. USA

1849 They immigrated to Tottenham, Ontario, Canada

They had 16 children, all born in Tottenham, Ontario, Canada

I have all the names and dates of birth of all 16 children if that would be of any help. I didn't add them since they were not born in Ireland.

I don't know the parents names of either John L. McMahon or Anne Quinlan nor do I know where they were married. I would like to know this info as well as the names of their siblings and of any living relatives still living in Ireland.  They were Roman Catholic.

John L. McMahon and Anne Quinlan are my Great grand parents.

Thanks so much for any help you may have

Rosemary McMahon Sherman