West Bengal Chief Minister Mamata Banerjee visited nephew and TMC leader Abhishek Banerjee's residence on Tuesday, ahead of CBI's questioning with his wife Rujira. Abhishek's wife, Rujira, is expected to answer CBI's queries today in connection with the alleged coal pilferage scam. Earlier on Sunday, a CBI team had visited the house of Abhishek Banerjee to deliver the summons but Rujira was not present.