Hi Lucille
I know so little about my Davis's, just what I have in the will. Mary Davis, nee Magee, would have been born circa 1770's and her children born circa 1810's. Robert does not appear to be a Magee name, so I assume that the husband of Mary Davis nee Magee, would have been Robert.
Quite possible there is a relationship, but would take much more research.
Any mention I your family writings of family with the name Magee, Mcbride or Berry (These are the families that my Magee sisters married into), or a farmhouse named Tully House?
Based on the date of the will, my Davis cousins were still in Cavan in the 1870's - 80's
regards
Jenni