New Delhi/IBNS: The murder of three out of four people in a family in Delhi's Neb Sarai was committed by their only surviving family member, police said as media reported.

Rajesh, 53, his wife Komal (47) and their 23-year-old daughter Kavita were allegedly stabbed to death at their home.

The couple's son, who had claimed to be out on a morning walk at around 5 am, had said he discovered his parents and sister being allegedly stabbed to death.

Cracking the case in a few hours, police said the son had murdered the three avenging a "humiliation" by his father and his parents' intent to pass on their property to his sister.

Police said the boy, who has been arrested, was planning the murder for a while and decided to execute it on his parents' wedding anniversary.

After the murder, a neighbour had reached out upon hearing a noise from the house.