A Queens man convicted of brutally murdering his mother and brother in the Queens home they all shared was sentenced to 50 years to life in prison Monday by an outraged judge who called him a “demon seed.”

After being castigated in court by his own grandmother, uncle and sister, Roscoe Danielson, 42, learned the price he will pay for the Fourth of July 2023 bloodbath in their East Elmhurst home.

“This is only the second time that this court has had within the walls of this courtroom a person who I can only describe as what I call the demon seed,” said Judge Kenneth Holder.

“To me, it describes a person who would take the very life of the person who gave them life. It’s a characterization of a person that is so rare that if a mother — if your mother — knew with certainty what terror th

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