Top ten grandmothers in fiction

At the Guardian, Jenny Downham tagged her ten top grandmothers in fiction, including:
The Absolutely True Diary of a Part-Time Indian by Sherman Alexie

Funny, wise and complex, this novel tells the story of bright 14-year-old Junior, who lives on the Spokane Indian reservation with his alcoholic parents. He has water on the brain, ten teeth too many, a lisp and a stutter and is regularly beaten