This is all thanks to the entire family playing their part in Grandpa Armitage’s special process known as “The Coagula,” in which the subject is conditioned, and ultimately subverted, by the personality of the transplanted brain tissue.
But Chris, in a fit of crafty behavior, starts to pick members of the family off one by one, and in thematically appropriate ways foretold by the film’s dialogue and soundtrack.
After two acts of mounting panic, Chris discovers the truth about the Armitage family: they’ve been transplanting their wealthy white friends into young, healthy black bodies.