My mother is having a family cookout on Friday.
She is inviting my half uncle who I have avoided and not seen for a year. He used to sell my sister(who is a recovering addict)drugs. Aside from that, he is also a right wing, Flat Earth conspiracy theorist. I have expressed to my family how much I dislike him and why I do not want contact with him. I hate lying and saying I have other plans that day, as I'm free all day Friday. My mother and my sister are still in contact with him. I do not trust him. I know it's only for one day, but every time I see him, I can't help but to feel so angry, hurt, and uncomfortable. I go to great lengths to avoid things that make feel uneasy. He has also went behind my back in the past and has caused fights between my sister and I by telling her things that I told him in secrecy when I was foolish and trusted him.
Am I being unreasonable to not want to go to this family gathering? Would you personally still go given the event if you were in my shoes?