Could you look at your grandfather the same way

My Nana died a few weeks ago and while she was on her death bed she made some death bed confessions. About my grandfather. She said she wanted to talk to me and told me never to let a man or anyone control me. We sat down and we talked for an hour. She told me that when she was young she never actually wanted to be with my grandfather. That she didn't like him and he acted entitled to her. But her parents wanted her to be with him. She said no and she had feelings for someone else. She fell in love with a black men. My whole family is white. Well my uncle everyone has had suspicions about because he does look like he could be biracial but my mom always said he was my Papas son. Finding out now that isn't true. My great grandfather(Nana's dad) shot him but didn't kill him. Basically shot him to threaten to kill him and made him leave town and threatened my Nana into being with my Papa and she told me my Papa raped her that same week and it's why he thinks my Uncle Joey is his. She said she completely believes my uncle Joey is her fomer boyfriends son. I thought she was having a senior moment and told my mom what she said and my mom didn't really say anything so I asked how about it. She said she knows the story. It was a different time back then. My Papa raised Joey so Uncle Joey is his son and he doesn't know any of this. My uncle Joey couldn't get back in time before Nana died so he never got a chance to hear what she had to say. My Papa has always been a little racist and we were always taught to ignore it because he was "born in a different time." My mom even justified him raping my Nana because it was a different time. How do you look at your family the same. Especially my Papa? And my mom told me not to tell my Uncle Joey anything.