My brother attempts to physically harm my father when my brother is upset, whats a good path to stop the insane behavior.?

my little brother 13 when my dad takes away my brothers phone or something my brother will attempt to wrestle him, my dad only fights back when he needs to defend himself but my brother will restrain him and attempt to gain control and take back the phone and he is quite tall and strong and this is becoming a... show more my little brother 13 when my dad takes away my brothers phone or something my brother will attempt to wrestle him, my dad only fights back when he needs to defend himself but my brother will restrain him and attempt to gain control and take back the phone and he is quite tall and strong and this is becoming a serious problem.
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