What's the difference between grandma, grandma, Jia Jia (who can't write), grandma and grandma?

I know grandma/grandma/grandma is the same person and both are mothers, but because they live in different cities, they use different methods.

For example, Beijing is generally called grandma, and some places in Shanghai are called grandma.

Grandma/Jia Jia is a title for older women, which is mostly used in Jiangnan, such as Shanghai dialect.