Jaiprakash (45) died today while Janni (4), Gulli (6) and Sakshi (10) are undergoing treatment after Sunita allegedly gave them milk laced with poison last night, Sardhana police station in-charge Mehar Singh said.
The children told police that their mother gave them milk and after drinking it, their health deteriorated, he said.
The doctors suspect that some poisonous substance was mixed in the milk, he said, adding the exact cause of death would be known after conducting the post-mortem, he said.