Your family has been taken by the body snatchers. The invasion has already begun.
From my own limited experience with fever dreams and that sort of stuff, it doesn't seem bizarre enough to be a hallucination. Odds are you were in the first rem period in a sleep cycle, the part where your dreams are short, generally realistic/boring, and rarely remembered because of the next one or two rem periods; you probably just woke up because of a noise or something.