The girl was rescued after a six-km-long chase by a police team and the accused were arrested, police said.
According to police, the incident took place around 7.30 PM when the siblings, were heading towards their home in Wazirabad area, and a car stopped nearby, with its driver asking for directions.
Once the girl's brother helped him with that, they were offered a lift to which they agreed.
They robbed him of his mobile phone and wallet before pushing him off the vehicle near Geeta Ghat, and fled with his sister.
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The boy then approached a PCR which chased the car. Other PCR teams deployed in the district were informed and the Santro car of the accused was intercepted after a nearly 6 km chase.
The accused, identified as Sachin Choudhary (32), Shiv kumar (32) and Saurabh (34), were arrested and a case under charges of abduction, robbery and criminal assault was registered in connection with the matter, a senior official said.
The three are being interrogated, the official said.