Is it normal to reject certain members of your family?

In other words, if you have shitty family members, I was wondering if it's alright (and normal) to reject them as family and consider them "Biological Strangers" or "Genetically Similar Enemies". You see, I refuse to see my biological father as my real father and I despise his side of the family with a ferocious passion. I was never his child, I'm not his child, and I never will be (I know it can't be helped DNA-wise but I can feel this way emotionally and spiritually). I hope him and the rest of his family die horrible, painful deaths alone in nursing homes (The only exceptions being my paternal half brothers and probably uncle). I'm not going to bore you as to why I hate him and don't consider him or anyone else on his side my family but let's just say he fucked up BIG time. Please. Don't hurt yourself trying to figure out my past. What happened to me, my mom, or my brothers is irrevelant to you. I'm no more important than anyone else. Probably less important, anyway.