In order to get further on the Grant family in Ireland, we need to get some identifyable dna samples from each of the main branches of the family. The simplified family tree, showing where samples need to come from is:-
This is my first attempt at outlining what needs to be done to do a DNA "map" of the Grants that landed in Ireland with the Norman invasion in 1169, and, one assumes, descended from one man - David the son of the Bishop of St Davids. The yellow signifies a kit has been sent to one of the descendants.
There appear to have been 3 main branches of the family from the Middle Ages through to Cromwell, with seats at Curloddy, Polroan and Ballynabouly, and some drifting into Waterford City.
With the Cromellian confiscations, which are well documented, many of the family stayed on in the Waterford area. The enigmatic figure of Jasper emerges to make his fourtune as a privateer, and a branch of the family drifted into Tipperary
The Tipperary branch has split many ways in the last 350 years, say 12 generations. I understand the structure of this splitting, and have based my DNA requirements on the plan above, which reflects what I know about how the family has moved through both internal and external migration.
Other Grnt branches in Southern Ireland, which I cannot hook onto my tree