You run into problems when you stipulate "literal" translations and can end up with something may satisfy your own needs and sensibilities yet be unclear, confusing, or downright puzzling to a speaker of the other language.
You're starting from an assumption that the word "brother" would have the same meaning and be used in the same sense in Japanese.
You're usually much better off with a functional translation than a literal one.
Unless you just want a piece of kewl-looking kanji decoration to plaster on something, in which case it doesn't matter a hill of beans one way or the other.