no the first cath casement nee garrett d 1725 - her will is on MNB + mentions 3 ua ch - I suspect Thomas then remarried but quite who Mrs Cath Casement MkII was I'm not sure
I suspect she is the mother of the possible twins but normally the parish reg would mention twins (they had a much lower survival rate) - I havn't got a match in the wills but I havn't done that much on Lezayre and it is possible she might have remarried.

The catch with the Grange + Kella is that they are abbeylands thus you need look at lib mon to follow land transfers and this is not as complete as Lords rent via Lib vas + Lib assed