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Thanks so much for your help and Scotlands People.   Have already added Blain to the tree.

So what do you think, not Blain as some of the ancestry trees have.

Thanks for the comments.  I agree about the age difference on the census which caused me to question if they are the correct parents.  I recently downloaded a copy of the marriage details from Scotlands People and found that there is no Mary Blain.  John Cook married Jean Bisset my ancestor in 1858, Jean was 20 at time of marriage , her birth I have is 1838, her parents were Thomas Bisset and Janet Bisset.  His parents are Joseph Cook (quarryman), His mother is Mary Cook nee Blawlean, at least that's what it looks like.  Too many letters for Blain.  Unfortunately I have no information as to what happened to Jean after John Cooks death.  I will keep looking.

Thank you so much for the info on John Cook, every bit of information helps to build a picture of my ancestors.

My uncles mother's name was Margaret Hamilton, my grandfather was Robert Welsh Russell.  The marriage certificate to Agnes Kerr does not match my grandparents names unfortunately. 
William Hamilton Russell was born 1919 in Camlachie, Glasgow.  He was the youngest of the three brothers, one brother being my father.  William is the only one I can't trace.  He moved to Ireland for a few years with my grandmother then came back to Glasgow around 1931/32.  I know nothing of his life since that time.  All I have is a photograph of him and a lady, I presumed was his wife.  He may have remained single throughout his life, I really don't know.  I don't have a date for his death.  Not much help really, but I thank you all for your interest.  This us one ancestor I may never have the full story.