A hardworking immigrant grandfather stabbed to death during his shift at a Brooklyn IHOP was slain by a former coworker he had always been friendly with, the victim’s family told the Daily News Sunday.

Hector Reinoso Perez’s relatives cried out in Spanish for “justice” as they mourned the 67-year-old victim, who was stabbed just before 10:40 p.m. Friday inside the IHOP on Flatlands Ave. near Louisiana Ave. in East New York.

“They had a good friendship,” said his granddaughter, who didn’t give her name. “They never had any arguments. They were good.”

Police took a person of interest in custody though charges are still pending, cops said Sunday. The killer used to work at the IHOP and knew Reinoso Perez, police sources confirmed.

A 41-year-old coworker suffered a slash wound to his

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