Hello Linda,
Does your mil have any idea where her parents married or roughly when? If you could find that out you will get your mil's mother's father's name and occupation and then you might be able to trace whereabouts on the census. that would at least give you an area of Scotland to search. If you give me your mils married name I can do a cross reference search on Scotlands people for you, (if you think they were married inScotland that is) as I have a few credits soon to expire. Scottish marriage licences provide both the mother and father of the bride and grooms details.
Regards
Diane