Cannot help with Janey but I believe that James was the son of John Middlemass(woollen manufacturer) and Isabella Broomfield Middlemass. I am descended fron their daughter Elizabeth Broomfield Laidlaw nee Middlemass. All their children as in Scottish tradition had their mothers maiden name as their middle name.
I have other information if interested. If you know anything else about the Middlemasses I would be interested?