Many thanks both of you for your help. I am resting this at the brick wall for now - I seem to be looking for a female birth in Scotland and possibly a sibling in Ireland, neither of which I can find. I am looking for a marriage - which I think will probably be in Ireland 1805-1810, but find nothing. If only Mary had lived a few months longer to the 1851 census, I may have had answers. Just one more question, it occurs to me that Mary and Joseph could have been married by a Military Pastor, or similar - do you know if this is possible and if so are there any records anywhere?
Kath