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Hi Colleen, I am also on Family Tree DNA with a kit of N63916.   I haven’t seen your name matching me on either site—but perhaps you have it under initials or a different title.   
I had found a ship passage from Ireland to NY in 1853 that I wondered if it was my Margaret’s family.  But it did contain a William aged 40 and Margaret aged 45 as parents (I assume).  I cannot find them anywhere in census data.  So, I am unsure if linked to me or not.   

Wonderful!   My Margaret’s birth year is an estimate or calculation from her census records and obituary.  She married Francis Burket in Detroit, MI—but we’ve never known more of her history.  My reasonably close DNA match with the descendant of John was a first glimmer!  I am on GEDmatch T494199. 
I was searching for Enniskillen Henderson’s since John’s info does state he came from there.  He would be about 10 years older than Margaret.  See if we pick up anything at all in GEDmatch.