this is the stupidest thing ever ❤ they are identical he can sees everything except for ...

Sure, but he had asked him before and he avoided the subject and said he didn't know him. He lied unnecessarily. He could have just told him "yeah, that's my brother but don't tell anyone" and all of this could have been avoided.

And now he's making it worse by not taking his partners worries seriously. He is just happy to see him happy - which i understand but is very inconsiderate of his partners' feelings.