Thank you very much, Adam!  Shame about the weathered one though - I know it probably makes little difference, but do you know if they were they particularly close together (physically, in the churchyard itself)?  And if possible, could I have those names that you gleaned from the other stone?  Even without dates and ages, it may be helpful to place a couple of relatives as having been buried there!
Thanks again - it may be morbid, but I can't help it - this is exciting stuff!
Sarah