Nona is Cat's grandma.
Grandma - Oma
He is in love with his cat and his grandma!
I call my grandma's aunt, Great Aunt. Maybe that's what you call her, but she is of course your great-great-aunt.
Cats cannot speak in human language, so we don't know what cats call them.
There is no Islamic term for grandma. They just call her grandma, in their respective languages of course.
She might look like one.
I think they call her Nana.
Dadi ma
grandma/pa
Baka or Baba
great grandma