New Delhi: Senior Congressman Ahmed Patel's son, Faisal Patel, was questioned for seven hours by the Enforcement Directorate here on Thursday in the supposed case of multi-crore bank fraud and money laundering by Sterling Biotech-based Gujarat. "Faisal was questioned about his relationship with the Sandesara brothers(Chetan Jayantilal Sandesara and Nitin Jayantilal Sandesara), owners and promoters of the Vadodara-based pharmaceutical company."ED officials said.The agency faced Faisal with a declaration by Sunil Yadav, in which he claimed that the son of the leader of the Congress had taken his friends to the farmhouse for a party and that all the costs had been borne by Chetan.This is for the third time that the financial probe agency has grilled the son of the COngress treasurer in connection with the case. On July 30, the financial probe agency had also grilled Ahmed Patel's son-in-law and advocate Irfan Siddiqui in connection with the probe.