Just read your post. Is the John McAdam you mention the same person who in the 1841 Census lived at Jameston on Damhead, Bonhill with his parents John and Janet along with his brothers James and William? Also on the 1851 Census was he living at Dumbarton Road, Jamestown, Bonhill with his grandfather John McAdam, his mother Janet and other family members? His Grandfather John McAdam was my Grt, grt, grt Grandfather. Thank you.