I think anything other than Uncle is fine. He is not their uncle, so that name makes for confusion.
In our extended family, we have Granny, Grandma, Grandma Cabbie, Nanny, Grandad, Grandpa, Pops, Papa, Gran, Grangran, Oma, Opa and various Christian names.
Changing from a Manual car to an Automatic after driving manual for around 50 yrs
