Briefing details of the arrest, Mandamarri Inspector Shashidhar Reddy said that Bamandlapelli Rakesh, a daily wage earner from Ramakrishnapur town was apprehended for killing his father Rayamallu (56), a retired coal miner on Thursday.
The incident came to light on Friday morning when neighbours spotted blood in the house of a man named Indu Mian in Bawaria village under Paharpur police station.
A man fired two rounds of bullets against his in-laws reportedly with a short weapon and then sped the spot at Saligama village in Kannepalli mandal on Tuesday night.
The victims have been identified by the friends as Anand Sujith Henry, his wife Alice Priyanka, and their 4-year-old twin boys, NBC Bay Area reported. However, the victims' identities have not yet been released, police said.