The child's family says they are outraged after discovering what they describe as mistreatment inside Burton Elementary School.
The student's mother, Maribel Vera, said she began noticing unexplained injuries in mid-April.
"The whole week he was coming with unexplained injuries," Vera said.
According to the family, the child returned home with scratches, burns, and bruises. Vera said she questioned school staff and even kept her son home for a day. When he returned, she said the injuries continued.
According to the family, they sought medical attention and contacted a case worker.
"We needed to rule out abuse, so that's why we started with the case and everything," said Daisy Vera, the child's aunt.
The situation escalated on Monday when the family said the district showed them classroom surveillance video.
"If you guys would see the footage, not even an animal gets treated that way," Maribel Vera said.
Family members allege the video shows a staff member handling the child roughly and making inappropriate comments.
"They dragged him across the classroom ... laughing," Vera said.
"They were making fun of his body ... fat-shaming him," said the child's uncle, Samuel Marquez.
Fort Bend ISD confirmed the employee involved is no longer employed by the district.
In a statement, the district said it "immediately initiated a review of relevant information" and reported the matter to Child Protective Services and local law enforcement.
The investigation is ongoing.
The family said they do not plan to send the child back to Burton Elementary School.
"We're all kind of lost because - where do we send him now?" Daisy Vera said.
The district sent ABC13 the following statement on Tuesday:
"After receiving a report last week regarding student safety, the district initiated an immediate investigation. During that thorough review, other incidents involving students were identified. The staff members involved are no longer employed with the district, as their conduct does not align with our standards. The matter has been reported to Child Protective Services and local law enforcement, and we are fully cooperating with the ongoing investigation.
At Fort Bend ISD, the safety and well-being of our students have always been-and will continue to be-our highest priority. Due to student privacy laws and the active status of this case, no additional details can be shared at this time."