What was the specific promise Babasaheb Tarkhad made to his son, and how did he end up breaking it?

Babasaheb Tarkhad made a solemn promise to his son to ensure his son would agree to travel to Shirdi. As recounted in Chapter 9, he assured his son, "Without offering Naivedya to Sai, no one should consume food at home." He told his son to be certain and not to doubt his word. However, one day, Tarkhad Saheb, who was a chief officer at a large mill, became preoccupied with his business. Due to this distraction, he completely forgot to make the daily offering of sugar candy as Naivedya. The entire household finished their meals without the offering being made, thus breaking the vow he had given to his son.