The incident took place last night when the accused entered the house after removing window grills and held the family hostage, DCP Kailash Bishnoi said.
The woman alleged that she was raped whereas her husband and father-in-law were injured with iron rods, he said, adding, the duo was admitted to SMS hospital.
Two minor children were also present in the house when the incident occurred.
The accused took away Rs 10,000 in cash, ornaments and other valuables.
A case in relevant sections has been registered with Vaishali nagar police station.