While the younger son died, the woman and elder son were undergoing treatment at a private hospital in Vijayawada.
The deceased, P Appa Rao, had reportedly tried to kill his wife in the same manner on Saturday evening.
Before abruptly ending his life, Chitturi Murali, a resident of Gannavaram, sent a voice message to his friends, in which he said that SI Narayanamma and her husband had harassed him.
Due to pressure to score better in exams, a 16-year-old Intermediate student reportedly attempted suicide by jumping from her five-storeyed hostel building late on Friday.
A 23-year-old youth committed suicide by hanging himself in his rented house at Santhi Nagar under Nunna police station limits on Tuesday morning.
The incident came to light when fellow students noticed R Sri Bhagyalakshmi (19) hanging and informed the same to the college management.