Dream of died, father, girlfriend, mother, name, woman

I am sitting in my second period classroom in a different seat than I usually do. A different teacher is also talking to the class, sitting on a familiar wooden stool. She isn’t teaching, she is just making conversation. Everyone is packed up and I get the sense that we are waiting for a call to let us go. I check the clock and it is about eleven am. The class keeps talking and I become impatient. When my teacher finally dismisses us, I turn around and notice it is 3:00 pm! I’m confused on why we have stayed in one class for four hours. The dream suddenly changes to a warm, candlelit dining room. The walls are light colored and the chairs dark wood. There’s even a tablecloth with set crystal glasses. I’m sitting next to my brother and sister, who for some reason are now Caucasian. My father is Dennis Quaid and he is warning us to be nice. Somehow I already know that the mother in my dream has died months ago and my father is just now finding a new woman, and she is coming over for dinner. My white brother and sister are sullen, but I am welcoming. She rings the doorbell and my father dashes up to open the door. My father’s prospective girlfriend , tall and blond, walks in and is seated my father. My brother and sister say hello reproachfully and I smile warmly and introduce myself. We are making awkward conversation when a letter is delivered for my father. He opens it and it is written by someone who has his exact same handwriting. It’s signed in by his name, with blood dried onto the signature. My father says that it threatens us to leave the house and nothing bad will happen. It’s strange because the letter is written to my father, from my father, and dated in the future. I wake up.