Hi, I realise you posted this a while ago, but these names are also in my tree! Alexander Bell married a Catherine Pope(?). They were my Gt Gt grandparents. Their son John Thornton Bell married Helen Finlay Stanners in 1872 in Carriden and they had a son, James Finlay Stanners Bell (b1888) who was my grandfather.
At the moment, i haven't got much further back than Alexander and Jean Miller.
Please get in touch if I can be of help!