Do half siblings have to be notified of death?

I am my father's only child. He gave everything to me in his will. My half brother hasnt spoken to me since our mother died 6 years ago. He and his family came for our mother's funeral and took everything that wasn't nailed down... and some things that WERE actually nailed down. He and his family HATED my father.

Am I legally obligated to tell him my father died? He is NO relation, he was NOT named in the will at all.