The Enforcement Directorate has arrested the wife and son of the alleged kingpin of the multi-crore Saradha chit fund scam Sudipta Sen. Wife Piyali Sen and son Shubhojit were arrested by the ED last night after they were questioned with regard to the alleged dubious transactions that led to the Ponzi scam. Both were arrested under the Prevention of Money Laundering Act and will be produced before a Kolkata court today.Hundreds of investors across West Bengal, Odisha and Assam were duped by the Saradha scamsters. The ED is jointly probing the case taking cognisance of the FIRs filed by the police in three states.