Calling grandparents by their first name - do you?

[WeAreAllLionesses]

DS (age 19) and I picked up my mum (mid seventies) yesterday and then drove to his gf's house. He got out of the car and his gf came out to say hello (first time she'd met DM).

DS said, "GF, meet my Gran". We all chatted for a bit and I then drove off with just DM for our day out.

My mum rang me later and asked if, as DS was now adult, he'd prefer to introduce her by her name, not as Gran in case it sounded childish.

DH, DS and I thought that was a really odd suggestion!

YABU he's adult and you call grandparents by their first name

YANBU nope, still Gran / Grandpa / Nana / Grandad / Nanny / Grandfather/ Grandma etc here whatever the kids' age!

Is your mum turning in one of those old and bitter people that hate everyone/everything

No, more of an over thinker!

I think it depends who you are introducing to whom if you are introducing your grandad to your next door neighbour i think I would say Bob this is my grandfather Fred and assume they would use Bob and Fred,
where my parents live in the Midlands it is an old tradition to call IL's Mom and Dad too but in Scotland people generally address IL's by first name

well i'd introduce her as both, this is ___, my nan/grandma, grandad