I saw my uncle kill my father

I saw my uncle kill my father and he now acts like nothing happened

I was there when my father was killed. I witnessed my uncle stab my father to death with a spear. It bothers me, because even though I was a minor then, as a boy in Class Two, the picture is still clear in my mind. My uncle talks to me like nothing happened between him and my father, yet he is the reason my mother is a widow and my siblings and I fatherless. I talk to his children, but I pretend to love them.