This is the dawning of the rest of our lives

Oh god it's taken me so long to write this, but everything has changed.
I found my father's body. I'd come back from my first trip out of the room and started write a blog post, when I noticed a pair of black plastic bags left on the side of the bed, a sharp heavy smell hanging around them, the neon plastic ties glowing poisonous. Now I feel like I knew in my gut what was in them before I even opened them, but I don't know if that's true.
Inside the first bag, swimming in bright red, was my father's face.
I tossed them out the window, didn't even give them a proper burial or report them to the police--I feel like there might not even be such a thing, I feel like they wouldn't help. Or maybe they'd think I did it, or my mom did it, or Kate. What if I was left to care for her?
That night I decided that I needed to know what was happening with my mom and Kate. I thought maybe they were in some kind of lesbian relationship, since they were sleeping in the same room and everything. Maybe my mom had even helped Kate adopt her? It hit me that she might be my sister, if they were together, and even though it would mean telling my mom I was bi a hell of a lot easier if it meant she was my sister I hoped they weren't.
And so that night, I snuck out and peeked into Kate's room. I don't know what I expected--them cuddling or something? A box of dental dams? A sign over their head that said GAAAY in rainbow letters? But god, I never expected what I saw.
They slept deeply and in between them she was sitting, watching them sleep. She turned to me, and looked me right in the eyes and at that moment, as her strange bloodshot eyes bored into me, I know that she was something inhuman and terrible and powerful, and that we are inextricably caught in her grasp.
I ran back to the guest room and locked the door, but I still feel her gaze cutting through me, and I feel like she'll see me for the rest of my life. She's some kind of alien or demon, I don't know what, but I know that she  wants to destroy us all.
And worse, that she could as easily as I could squash an ant.