A Queens man was stabbed to death by his older brother inside of his home Friday afternoon, police and sources said.

Officers found Sean Sarker, 21, with stab wounds to the neck and shoulder at his home on 74th Street in Elmhurst around 2:20 p.m., according to the NYPD.

He was taken to Elmhurst General Hospital, where he was pronounced dead, cops said.

Police said they arrested Salman Sarker, 24, at the scene on manslaughter and weapons charges.

Sources said Salman, an employee with the city’s Department of Correction, allegedly killed Sean after threatening their mother. The suspect had allegedly been threatening the mom when his younger brother stepped in to defend her.