Why would my own uncle block me on Facebook?

I noticed that my uncle blocked me on Facebook. I've never had my own family member block me like that, and he lives with us. Just to let you guys know, I haven't annoyed him in any way and neither did we have any misunderstandings. We're completely happy. We were never friends on Facebook though, because you know awkwardness to be friends with you're uncle. I had no Idea that he knew that I had an FB account though. I have no Idea how he found my profile and blocked me since he's the type of person not to bother even looking me up. I've noticed he blocked one other family member of ours... What do you guys think, is there a reason as to why he did this?
Why would my own uncle block me on Facebook?
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