Went out to eat tonight with my sister, her three year old and my almost one year old. Her kid kept acting out. My sister kept trying to threaten her with punishments but she never followed through. Finally the little girl was getting dangerous in her playing around so I leaned toward her and told her to knock it off or I would punish her. She sat down and put her jacket over her head. My sister doesn't follow through, but I do. Now my sister says her daughter is afraid of me. Her actions after the meal didn't show me any reactions of fear (she grabbed my hand to cross the car park). I only stepped in when I saw danger and when I couldn't let her behavior continue. Was I wrong?