Here's a summary of what happened.
Jacob Pengelly of Sortridge in the parish of Tavy St Peter, Bachelor in Physic/Medicine, wrote his will on 20 January 1725/26. Apart from a bequest to his ‘Sis Dunninge’, he left everything to his brother
Henry Pengelly, Rector of Tavy St Mary, the sole executor.
Because there were no witnesses to the will, its validity was challenged by ...
Jacob Pengelly’s four sisters ...
Winifred Ellacott (wife of John Ellacott)
Elizabeth Dunning (wife of John Dunning)
Thomazina Roe, widow
Frances Pengelly, spinster
...
and his nephew and niece John Jope/Hope(?)
Frances Moore (wife of Edmund Moore)
On the basis of depositions made earlier, the court confirmed by Judicial Sentence on 21 May 1726 that the will was valid, that Jacob Pengelly was mentally competent when he made it, and that Henry Pengelly as the appointed executor could apply for probate. Probate was granted in the PCC on 9 June 1726.
As mentioned above, there are two copies of the will (in English) in the PCC registers, identical bar copying glitches. One was made on 17 June 1726, when the original will was taken away for use by the executor. This copy was certified in the register as a true one, and the original will was handed over and signed for. The later copy will have been entered in the register when the original will was returned. The two register copies could then be cross-matched to check that the original will hadn’t been tampered with while it was out of court.
Hope that helps. Lots of marriages to look for.