How was Babasaheb Tarkhad convinced to take over the daily worship of Sai Baba while his son was away?

Babasaheb Tarkhad's son, a devout follower, performed daily worship and offered Naivedya to Sai Baba's photograph. When his mother wished to visit Shirdi, his father wanted him to accompany her. The son was hesitant, worrying who would continue the daily rituals. As detailed in Chapter 9, the son, knowing his father was a follower of the Prarthana Samaj and not accustomed to idol worship, made a specific request. He insisted that his father must promise that no one in the house would eat before Naivedya was offered to Sai. The father, seeing his son's devotion, lovingly agreed to this condition, assuring his son he would offer the Naivedya daily. This assurance is what convinced the son to go to Shirdi and established the father's role in the daily worship.