A case was registered against Sarvesh and her siblings, Satpal and Vikram, for killing Rajiv yesterday, they said.
The 26-year-old victim had gone to his in-laws place to bring back his wife who was staying at her parents' house for the last two months following a domestic tussle, police said.
Rajiv's body was found near Hindun river, they said, alleging the trio killed him.