Nina Bawden 
Granny the Pag [EPUB ebook] 

Catriona Natasha Brooke’s granny is totally unlike other people’s grandmothers. When she isn’t dressed in motorbike leathers, Granny the Pag wears dirty black skirts that trail on the ground and fastens her old sweaters with an enormous black broochencrusted with diamonds. Even worse, she smokes! The Pag can be a social embarrassment, but when Catriona’s relationship with her is threatened, Catriona fights for the right to choose where she lives and who with — she chooses Granny the Pag.