Guys, Why do I see this guy staring at me?

I cannot think of a single reason why I see him staring at me! It's happened 3 times and it's not because he likes me, because he's older than me, I'm weird, and I'm friends with his sister. Occasionally I'll see him looking at me when he's talking to someone else and he completely ignored me 3 times while talking to my brothers. Does he think I'm diseased or something? I seriously do not think that he likes me, but I don't know why he would gossip about me or anything. He doesn't seem like the type of guy to do that.
Guys, Why do I see this guy staring at me?
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