Dream of grandfather, grandmother, mother, spiders, father

I dreamed that I was standing in the kitchen with my family and my Aunt walking around, making dinner I think. My dad walked in with the coffin of his older sister, my aunt, and laid it on the blue stool next to the kitchen table. He also brought in the coffins of his mother and father, my grandmother and grandfather. I look in the coffin of my aunt, and saw that her skull and most of her bones were bleach white, except for her pelvic area. Her body was still decomposing and her thigh muscles were red and still attached. There were black spiders crawling all over her inside the coffin. My dad said we were doing a "coffin change" or something like that, and moved his mother and father's body into the same coffin as my aunt. My grandmother and grandfather's bones were yellowing, obviously older, but still decomposing. My aunt said that it was time to put on the music; my grandmother played the piano, so she got out a CD of her playing and put it in the CD player we have in our kitchen. I stood in horrified silence staring at the bodies while everyone else made dinner. My Aunt sat in a green chair we got rid of long ago, from our old house.