The accused, identified as Chintu, also sustained severe injuries as he was held and thrashed by neighbours who managed to catch hold of him, said a senior police officer.
Chintu allegedly had strained relations with his wife Renu who had left him and was staying at her parents' place and had even filed for divorce from him, the officer added.
Chintu attacked Renu with a large tent nail at her parents' house in Jatav Basti around 7.45 pm and when his mother-in-law Roshan intervened, he hit her on the head, police said.
Chintu's daughter Neha, Renu and brother-in-law are currently undergoing treatment at AIIMS where their condition is stated to be critical, said the officer.
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When neighbours heard cries for help from the house, they came and managed to catch hold of Chintu who was trying to flee and beat him up, police said.
He is currently admitted in AIIMS and is in a critical condition, police said.
Renu and Chintu's families had arrived at an arrangement that she would stay at her parents' house but Chintu didn't accept this arrangement.
In a fit of rage, he attacked Renu and his family.
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