Don and Mum and her brothers would be 3rd cousins twice removed so we needed triangulation to confirm the relationships.
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Prior to her emigration to Australia conditions in Ireland were tough, with widespread hunger throughout the country in 1838.
Descendants of Mary who inherited her mtdna should also belong to the J1c5 haplogroup.
It would not be surprising if the family was much larger.
If Stephen was involved with the Ribbonmen and was their leader it does seem probable that he may also have been connected to the events at Macken.