What connection is described between the author Shri Saraswati Gangadhar and the subject of his biography, Shri Narsimha Saraswati Maharaj?

Chapter 0 details a significant ancestral connection between the author and the protagonist. The surname of Shri Saraswati Gangadhar was Sakhare. An ancestor in this Sakhare family, Shri Sayandev, received the grace of Shri Narsimha Saraswati Maharaj directly. As part of this blessing, Shri Sayandev received a boon promising that 'My constant service will be performed by your descendants.' According to the information provided in Chapter 0, the author Shri Saraswati Gangadhar is the fifth descendant in this lineage from Shri Sayandev, thus fulfilling the ancient boon through the creation of the Guru biography.