My Brother-in-Law does not Believe that Capsuleers Exist.
He says that the “Sky People” are a Myth told to scare Naughty Children.
I am Unable to provide any Evidence that is sufficiently Convincing.
I am at a Loss as to how to Proceed with this Situation.
Does Anyone have any Suggestions 
Put his butt into a Venture and drop him at an asteroid belt in Uedama. He’ll soon learn about Capsuleers 
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Have you considered that he might me a stupid person?
Why does it matter to you what he believes? What concrete problem does his eccentric beliefs cause?
When Someone utters something that is Demonstratably False within my Presence, it tends to create a Sensation that I Experience as a Buzzing Noise in my Brain, which Annoys Me, and I feel extremely Compelled to Correct Them.
Plus if he Brings it up when I am Visiting, then my Sister will also start Arguing, and then the Two of them leave the Room to argue in Private, and I am left to entertain the Children and I find it A Bit Exhausting to play the role of “The Fun Auntie” to multiple children Simultaneously.
You think they leave the room to ‘‘argue’’ in private.
That’s a curious belief on its own.