Amit, his wife Sarla and daughters Tannu (one and a half years old) and Mannu (six months old) lived in a rented room at Bhangel village here, police said.
Today, Sarla and the two daughters were found dead in the room while Amit was not traceable, they said.
Police said Sarla, a resident of Greater Noida, was married three years ago to Bhangel resident Amit.
Her father Jagvir alleged that her in-laws were demanding a car, police said.
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During investigation, it was learnt that the couple had a fight last night.
Polie said a murder case had been registered and dowry- related sections had been included.
Police has detained Sarla's in-laws and are questioning them.
They said it had also been alleged that Sarla's in-laws were angry with her as she had given birth to two daughters and they wanted son, police said.