An elderly woman and her grandson were found dead in a house of an Italy-expatriate at Mijmiji Kandapara in Siddirganj upazila of Narayanganj on Thursday morning.
The deceased were identified as Parvin Begum, 50, caretaker of the house and her grandson Mehedi, 9.
Mohammad Sarfuddin, additional superintendent of police (Zone-Ka) of Narayanganj, said locals smelt an unpleasant odour coming from the locked house of Tofazzal Hossain, an expatriate of Italy and informed police.
Police later recovered the bodies from the house, he added.
The elderly woman and her grandson, who used to live at a room of the house, might have been strangled to death, he added.