CBI today grilled former Rajasthan Minister Mahipal Maderna's wife Leela and two sons of Luni MLA Malkhan Singh in connection with the Bhanwari Devi abduction case. Official Sources said they are all being quizzed in Jaipur.Osian MLA Maderna is under judicial custody, while Luni MLA Singh is skipping questioning for the past several days despite repeated summons.The probe agency may seek his arrest warrant today. Bhanwari, 36, posted as an auxiliary nurse at a sub-centre in Jaliwada village, is missing since 1st September.