James stewart and Margaret Robertson????

I am looking of ANY info on these 2. They would be my 4x great grandparents. They had 10 children. John, Thomas, Donald ,James,Alexander (my 3xgreat grandfather) Margaret, Dorothy, Elizabeth and Betsy.. I am looking for dates and who their parents may be ( my 5x greatgrandpatprents). Any info would be great
Thanks

Ps the only info I have is that James may have been the last lifer renters of the Dalguise Estate in Ethshire Scotland and she may be the daughter of a Laird of possibly craigsiel