Some of my neighbors don't want covid vaccination

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While walking early in the morning, I came across three (3) of my neighbors who were discussing COVID vaccination. Two (2) of them are brother and sister in their 60s who are not yet vaccinated and the other one (1) is just living adjacent to their respective houses and had full COVID vaccine. I joined their conversation and told them that there's nothing to be afraid of the vaccine. But they really don't want it. I gave them a sample and comparison, I told them about my officemate who is not yet vaccinated and my cousin who is fully vaccinated. They're both positive of COVID. They were confined in the same hospital and stayed there for two (2) weeks. My cousin was discharged after she recovered while my officemate was likewise discharged however, he was advised to have an stand by oxygen tank in case he will be short of breath as he has not yet fully recovered although he is already negative of the virus. But my neighbors, this brother and sister vehemently refused to understand what I have told them. So I gave up. I went to my sister's house thereafter, I went to the store to buy vegetables. Maybe they have their own reason why they don't want the vaccine. They have the right to refuse.