The deceased were identified as Nazma Aktar, 35, sons Md Shamim Hossain, 12, and Solaiman Hossain, 6, of Rakkhit village under Ganguldia union.
Earlier around one year back, Nazma’s husband Raja Mia was also found dead.
Locals said the mother and her sons were scheduled to go visit her daughter Nasrin at her in-laws in Kamarpara village under the same upazila on Monday morning.
As they didn’t go till 12pm and were found out of reach over mobile phone, Nasrin rushed to the father’s house and found the bodies lying on the bed.
Officer-in-Charge of Dhamrai police station Md Monir Islam said being informed they recovered the bodies and sent them to Suhrawardy Medical College Hospital morgue for autopsy.
Expressing grief over the matter, he said a case was filed in this connection.
Demanding justice for the deceased, Nasrin said they had long been in dispute with some people over land, and suspects that they might have murdered her family members.