Frances further to your comments,
I believe that it is Issable's daughter Catherine who came back to the Island from Ireland with husband Richard Keates as it is only one month off 2 years (Apr 1725) from when her mother died (May 1723) as expressed in the will, and the piece at the end mentioned Catherine execr. which the daughter was named as in the will, however I am aware that Finlo Cretney was sworn in as such at Probate.

The grand daughter Chatherine received her 8s & 6d but is still a little confusing
nonetheless.

Another thing which is not clear is whether Chatherine, the granddaughter, is the illegitimate daughter of daughter Chatherine (of Ireland) or perhaps a daughter of a Qualtrough brother-in-law of Issable.....oh the life of a genealogist!! Forever solving problems/jigsaws, but then I guess that is what keeps us involved.