What Should I Say to Someone Who Believes Zodiac Signs Determine Personality?

Questions about how to respond to a family member who believes Zodiac signs determine personality and what to say to a co-worker who believes aliens created humans and put them on Earth 250,000 years ago. How would you respond to a family member who believes Zodiac signs determine personality? What should I say to a co-worker who believes aliens created humans and put them on Earth about 250,000 years ago?