PUDUCHERRY: A physiotherapist, who murdered his father, 75, and his nephew, 13, and disposed the bodies after chopping them into several pieces, was arrested by police in the Union territory of Puducherry on Thursday. His mother, 65, who helped him to cut up the bodies, was arrested along with him. They were identified as S Siva alias Sivakumar , 42, and his mother S Vasantha, 65, from D Nagar.Superintendent of police Rachna Singh said enmity prevailed between Selvaraj, a retired driver from Jawaharlal institute of postgraduate medical education and research (Jipmer), and his son Sivakumar, a physiotherapist practising independently and his wife Vasantha over sharing of properties. His grandson Bharath, 13, was staying with him after his daughter S Shakila, separated from her husband.The SP said a quarrel broke out between the father and son on April 15 and in a fit of rage Sivakumar murdered his father using small vegetable knives and scissors. He also attacked his nephew who attempted to save Selvaraj. His mother, who was in the terrace when he murdered them, rushed down on hearing the screams.He and his mother decided to cover up the crime and chopped the bodies into several pieces. They threw the pieces into several plastic bags. Sivakumar carried them in a gunny bag, placed on his motorcycle and dumped it into a 200-foot deep brook at Poothurai village in Tamil Nadu. He and his mother disappeared after committing the crime.The murder came to light on April 19 after their neighbours complained of foul smell emanating from the house. A police team after establishing contact with Shakila, broke open the house only to find blood stains.