Parents and aunt were held for interrogation over the mysterious death of two siblings in the capital’s Rampura.Rapid Action Battalion (RAB)-3 detained them from Natun High school Mour area of their native village in Jamalpur on Wednesday.The detainees are parents Amanullah and Jasmine and Jasmine’s sister Mili.They are being brought to Dhaka for interrogation, it is learnt.Viqarunnisa Noon School student Ishrat Zahan Oroni, 14, and her brother 6-year-old Alvi Aman were declared dead by Dhaka Medical College Hospital when they were taken to the hospital in unconscious condition on Monday night.The family said they ate food at a restaurant on Sunday night and took home the leftovers. They ate the leftovers on Monday afternoon and went to sleep and did not wake up.