Who is Grandfather Tazi from Dreams of Trespass: Tales of a Harem Girlhood and what is their importance?

Grandfather Tazi is Fatima's maternal grandfather, he lives in a rural area and works to keep the peace between Fatima's grandmother, Yasmina, and the seven other women he keeps as wives. His family originates in the Rif region and Fatima notes that he looks like the people of that area.