The accused Rajesh and Gulshan, both natives of Saharanpur of Uttar Pradesh, were arrested by the police and a pair of gold ear rings of the murdered woman that were mortgaged were recovered, said Pushependra Kumar, DCP of West Delhi.
The victim Deepmala alias Deepa and her son Saksham, 10, and daughter Shally, 7, were found murdered with their throats slit at a rented accommodation of Mohan Garden in Uttam Nagar, on June 1.
The police launched investigations and two teams were formed that scanned CCTV footage and analysed call details of suspected mobile numbers.
Amit told the cops that he doubted the role of his brother-in-law (Sadhoo) Deepak who was a resident of Jatav Nagar in Saharanpur.
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It was also found that Deepak and his wife Madhu were having estranged relationship and Deepa was mediating to improve their relationship.
She had also threatened to report the matter with the police to put pressure on Dipak.
The call details of Dipak's phone led police to Rajesh who was arrested and thoroughly investigated, said the officer.
Rajesh revealed that Deepak hatched a plan to kill Deepa and rob her house in Delhi with his and Gulshan's help.
On June 1, Deepak visited victim and allegedly killed her. After removing two rings and ear ring from deceased he was leaving when both the children came in the house. Sensing that he had been seen by them, Dipak dragged both inside the bathroom and slit their throats, said the DCP.