The Imam would not eat his meal if our mother was not at the table. He would wait even if everybody else was present at the table and when our mother would take her seat at the table the Imam would only then begin to eat his meal.
Name of the narrator: Hujjat al-Islam wal-Muslimeen Sayyed Ahmad Khomeini, Ashena journal, vol. 1.
Title of the Book: Impressions and Memoirs about Imam Khomeini's Practical Behaviour, vol. 1, chapter one, page 77