Who is Pishi from Sister of My Heart and what is their importance?

Pishi is the widowed aunt who lives with Sudha, Anju and their mothers. Because Pishi had no children, she loves and cares for Sudha and Anju like they are her own children. Pishi enjoys telling the girls the stories of the old ways. Pishi is the one who takes care of the newborn babies the night they are born.