Hi Viv,
If you have a Kewley male who is willing to be tested - let me know with the details of his oldest known Kewley ancestor, name, dates and parish and I'll compare it with what we have on the Kewley who is tested already - and also ask you if your recognise the other Kewley - if the answer is no then we can be pretty sure that they are more than 3rd cousins apart. Its a pragmatic approach that so far has worked,
cheers
John