Hi Mervyn,
No I am not researching the Callister family tree. I just posted the listing of Collisters/Callisters in the event it may help people....

I do hope you are able to track down your Grandfather's information in Scotland. There was quite a bit of migration of Manx to Scotland 100 years ago or so, so I am sure you will eventually gather the into you need and find your link to the Isle of Man as both Callister and Crellin are Manx names.

Elizabeth
Queensland, Australia