why I ask is that not clear if Sayle was Isabella's maiden name or married name - if she was not married and had an illegitimate child that would have been known by the father's name (and on a small Islanmd the father would generally be known) - she would also have been presented to a consistory cout for fornication.

As you know their approx birth dates can you elucidate how these were derived (ie any known checkable dates and or places)