Mohammad Shafia called his children liars and he denied he had anything to do with the deaths of four members of his family in a police interrogation conducted the day after he was arrested. A videotape of the two-hour interrogation was played Wednesday at the trial of the Montreal man, his wife Tooba Mohammad Yahya, 41, and their son Hamed, 20, who are each charged with four counts of first-degree murder. They have pleaded not guilty.