Yeah same here. But my grandma, not Nanna.
It's just Nana and Granda in the sunny climes of South Durham
I had two Nanna's, one gran dar and an uncle ted ( thats what we called one of me Nannas second husband)
My son had a Nanna (my dad died when I was pregnant ) and a grandma and a gran dad
My contemporys who have been blessed with grand children are mostly opting to be called "Grannie" now .