Scottish people would call their Grandmother 'Granny'.
Grandma - or grandmother
You call people living in Australia, Australians.
Your grandmother's grandmother is your great-great-grandmother.
people
Great Grandmother
Your grandmother's mother would be your great-grandmother.
Your grandmother's mother would be your great-grandmother.
She is your paternal grandmother.
In Marathi, you would call your grandmother "आजी" (pronounced as "Aaji").
Aussies or Australians.
Gram? is that her grandmother if it is then it is your great grandmother