“I once asked Abu ‘Abd Allah (a.s.), if a man is required to ask permission from his father. He (the Imam) said, ‘Yes, I would ask permission from my father and my mother was not with him. She was my father’s wife. My mother had died when I was a boy. I did not like to disturb their privacy and they also did not like it. It is very correct and fine to say Salam (the phrase of offering greeting of peace).'"