Putkar Kerai and his family members were having meal last night when Putkar's brother Harish rushed in and allegedly poured poison in the meal.
When Putkar resisted, Harish attacked him with a sharp weapon injuring him fatally, police said.
Putkar's wife Mukta and 7-year-old son Deepak ran for safety but Harish and his other brother Juggu caught the boy and allegedly killed him.
Harish was arrested from Kasia jungle while Juggu was reported at large, the police said.