老大哥 is how to write “big brother” in Chinese.

It literally means “respected big brother.”

This does not have the same idiomatic meaning in Chinese as it does in English regarding government surveillance etc.

血兄弟 means “Blood Brothers” in Chinese and Japanese.

兄弟 is a Chinese, Japanese Kanji, and old Korean Hanja title for brothers.

Some notes: It's kind of an uncommon title for a wall scroll.
In Chinese, this is usually understood as brothers. In Japanese, it can extend to mean “brothers and sisters” or siblings.

兄姉 means “brother and sister,” in Japanese.

There's no perfect way to say it in calligraphy, but this is probably the best way.

手足情 is the love between siblings.

When you love, protect, care for, and have a deep bond that only brothers or sisters can.

The actual translation is “Hand and Foot,” but the relationship between brothers or sisters is like that of hands and feet. They belong together and complete the body. Even though this says “hand and foot,” it will always be read with the brotherly and sisterly love meaning in Chinese.

Note: During the past 20 years, the “One child policy” in China is slowly making this term obsolete.

御兄弟 is a Japanese honorific title for brothers and sisters or siblings.

Please note: It's kind of an uncommon title for a wall scroll.

布拉瑟頓 is the name Brotherton in Chinese (Mandarin).

ブラザートン is the name Brotherton in Japanese Katakana.

Note: Because this title is entirely Japanese Katakana, it should be written by a Japanese calligrapher.

In Chinese and Korean, 博愛 means a universal fraternity, brotherhood, or universal love.

In Japanese, this means charity, benevolence, philanthropy, or love for humanity.

Please note these subtle differences and take that into account depending on your intended audience (Chinese, Korean or Japanese).

See Also:  Benevolence | Altruism

一視同仁 is how to write “universal benevolence.” This is also how to express the idea that you see all people the same.

If you are kind and charitable to everyone, this is the best way to state that virtue. It is the essence of being impartial to all mankind, regardless of social standing, background, race, sex, etc. You do not judge others, but instead, you see them eye to eye on the same level as you.

See Also:  Benevolence | Compassion | Equality | Justice | Right Decision | Selflessness | Work Unselfishly for the Common

賢弟 is an honorific title for a little brother.

This can be translated as a worthy little brother or wise younger brother. This can also be a polite reference to another person's younger brother, your junior, or your subordinate.

阿兄 is a Chinese and Japanese title for elder brother.

阿兄 is an honorific title, like saying, “my dear brother.” A nice way to pay tribute to your big brother or older brother on your wall.