Uchi Wa No Utouto Maji De Dekain [better] -

"People will think you are making a very dirty joke. If you genuinely want to say your brother is tall, use 'Uchi no otouto wa se ga takai' or 'Uchi no otouto wa kyojin da' (he’s a giant). Avoid dekain unless you are trying to be edgy."

: Much of the humor and charm comes from the brother's polite and gentle nature despite his "giant" appearance. He often forgets his own strength or size, leading to accidental property damage or cramped living conditions. uchi wa no utouto maji de dekain