Not sure if this is at all relevant, but I have a Cummings family in my tree, also in Magilligan, Ballycarton, though they're not direct ancestors of mine. My great-great-grandfather was Dominick McLaughlin (b. 1834 in Magilligan). His brother, Daniel (b. 1844), married Elizabeth Cummings (b. 1844) in 1866. They had six children, and I am a dna match to some of the descendants of those children, but through the McLaughlin line, not the Cummings line. I have a census record that a David Cummings (b. 1858) was living at the home of my gr-gr-grandfather, Dominick McLaughlin, in Neilston, Renfrewshire, Scotland in 1881. I checked David out, and he was apparently the brother of Elizabeth, Daniel McLaughlin's wife. So he was Dominick's brother's brother-in-law. There may have been lots of Cummings' in Magilligan at the time, but it was a tiny village, so I'm sure they're all somehow related. Sorry if this isn't helpful, just thought I'd post in case it may be.
Kat
