Granny and Banff Granny
the reason being that Granny lived in the city and Banff Granny surprisingly enough lived away up in Banff on the north coast. Granda was Banff Granny's husband but he died when I was about 4 I think so never really referred to him as anything, and my dad's dad died long before I was born, he died when my dad was my age (22).