his brother, andrew, were smts in this investigation. >> neither he or his brother had been notified they were the subjects of the criminal by prosecutors. they had been defendants in a large number of civil lawsuits but never had been any indication they were criminal suspects at all. >> they have never been charged. mark and andrew turned their father in? >> they did. their father confessed to their sons after they pressured him about a plan he had to deliver some bonuses to members in the firm about two months ahead of schedule. this was in the aftermath of the great financial crisis. 2008. they thought it was unwise and challenged him about it. and in response he asked them to go with him to the family apartment near the office and it was there he told them the business they thought was the family heritage was a ponzi scheme, the price tag at $50 billion. they were stunned and left