Don't try to convince them forcefully, or else you will strengthen their belief in brainwashing. Explain rationally why YOU believe the vaccine works, and the e

Don't try to convince them forcefully, or else you will strengthen their belief in brainwashing. Explain rationally why YOU believe the vaccine works, and the evidence as to why you are convinced, and accept if they don't change their beliefs. From experience, sometimes people are very refusing when arguing in person, but over time they think it over and might change their mind.