The deceased were identified as Gulnahar Begum, 34, and her son Md Rifat, 9.
Gulnahar lived at a rented house of Chandgaon Pathania Goda area with her son and RMG worker daughter.
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After returning from factory, her daughter Mayuri found their house’s door open and spotted her brother’s body on the floor and her mother’s body in the bathroom, said Ataur Rahman Khandaker, officer-in-charge of Chandgaon Police Station.
Several injury marks were found on their bodies, said the OC.
Police said they suspect one Faruk, a family friend of Gulnahar, is behind the incident.
Mayuri said Faruk, who sold food made by her mother, addressed Gulnahar as sister. Faruk threatened her mother several times over money related dispute.