grand‧moth‧er S3 /ˈɡrænˌmʌðə $ -ər/
noun [countable] the mother of your mother or father
REGISTERPeople usually say
gran (in British English) or
grandma when talking to or about their own grandmother:
My grandma used to make lovely cakes. [TahlilGaran] Dictionary of Contemporary English ▲