The accused was was irked as his father often fought with his mother and would beat her up.
A 28-year-old unemployed man allegedly killed his father in the early hours in Thane today after being annoyed over frequent quarrels with his mother, police said.
Vishnu Arun Alzonde was irked as his father Arun Alzonde (55) often fought with his mother and would beat her up at their home in Kalwa area of the district, they said.
He was miffed with his father, who allegedly doubted his wife's character and used to abuse and torture her after coming home in an inebriated condition. He also could not tolerate his father's brother and grandmother supported Alzonde and criticised his mother, police PRO Sukhada Narkar said.
The accused, shortly after midnight, attacked his father with a steel rod and killed him.
Vishnu also attacked his uncle Datta Alzonde and grandmother Pamabai Alzonde, who tried to intervene in a bid to save Arun, he said.
The accused was arrested this morning and a case under sections 302 (murder) and 307 (attempt to murder) of the Indian Penal Code was registered against him.
The body has been sent for postmortem, Mr Narkar said.