Flashing Lights

My mother, sister and I were in her bedroom. She wanted to give us her jewelry. As we were going through her jewelry and talking about the history of each piece all of a sudden the light flickered on and off. It was a sharp cut of a flicker. We all said it was a sign from my dad. Later that evening I began to second guess it wondering if I did it by touch the light switch. I tested it out, the height of it  was to high and would have been such an uncomfortable position, and I would have felt if I did it. I pray that this was a sign from dad.