The maternal grandfather of the boy, a class XII student of Kendriya Vidyalaya in Gannipur here, lodged an FIR with SC & ST police station on Monday.
In the FIR he also claimed the entire family was terrified because the father of the two brothers is a notorious criminal lodged in jail outside the district in a murder case.
They have also been removed from the school which gave them forced Transfer Certificate.
School principal Rajiv Ranjan had lodged a written complaint with the Kaji Muhammadpur police station.
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The purported video of the incident shows the two brothers -- one of them a student of class XII and the other of class XI -- pushing and thrashing the victim in presence of some other schoolmates on September 25.
Meanwhile, police has assured security to the family of the boy.
He said he had told the school Principal that there should be no inconvenience to the boy in the school in the wake of the incident.
Union Minister of State for HRD Upendra Kushwaha had taken strong note of the video and on his directive a team of Kendriya Vidyalaya officials had paid a visit to the school on October 14.