Can you describe the relationship between Sai Baba and Tatya Patil, and Tatya's role in the Chavadi procession?

According to the details in Chapter 37, the relationship between Sai Baba and Tatya Patil was one of immense mutual love, so close that Tatya affectionately called Baba 'Mama' (uncle). Tatya's role was crucial to the Chavadi procession. Baba would patiently wait for Tatya to arrive before preparing to leave the Masjid. It was Tatya who would initiate the departure by putting his hand under Baba's arm to help Him stand. He would also place a beautiful golden-bordered shawl over Baba's head. During the procession itself, Tatyaba held Baba's left hand, guiding Him along the path to the Chavadi, demonstrating his indispensable and intimate role in Baba's life.