What did Babasaheb Tarkhad do immediately after realizing he had forgotten to offer Naivedya, and how did this involve his son in Shirdi?

Immediately after realizing his mistake, Babasaheb Tarkhad was overcome with grief and repentance. Chapter 9 describes how he prostrated at the feet of Sai Baba's photograph, his heart choked with grief, and begged for mercy. Feeling helpless after this emotional plea, he decided he needed to inform his son. He promptly sent a letter to his son, who was in Shirdi, confessing his "great error." In the letter, he implored his son to ask Sai Baba for forgiveness on his behalf, seeking protection and compassion from the merciful Maharaj for his failure.