How to Say “Half Brother” in Japanese

異父兄弟
ifukyōdai
The Japanese phrase for "half brother" is 異父兄弟 (ifukyōdai).
異父兄弟 is a noun used to specify a male half-sibling. In casual conversation, Japanese speakers often simply use 兄弟 to refer to siblings, even if they are half-siblings, unless the specific distinction is necessary for the context.
Meaning: male half-sibling (noun)

What does it mean word for word?

The term is composed of 異 meaning different, 父 meaning father and 兄弟 meaning siblings or brothers.

Is there a formal and an informal way to say it?

異父兄弟 is a technical or formal way to describe the relationship, often used in legal or genealogical contexts.

How do you pronounce it?

ifukyōdai

Did you know?

  • Japanese has distinct terms for half-siblings based on which parent is different, whereas English uses one phrase for both cases.
  • The kanji 異 in 異父兄弟 is the same character used in 異常 meaning 'abnormal' or 'strange'.
  • Historically, the distinction found in 異父兄弟 was vital for the 'ie' system, which dictated strict inheritance rights within the household.

Examples in context

  • トムは、異父兄弟なのよ。
    Tom is my half brother.
    This sentence is useful for stating that Tom is a 異父兄弟.
    Tatoeba #10736102 by small_snow, translation #2619673 by CK
  • モハンドは、異父兄弟なのよ。
    Mohand is my half brother.
    This sentence is useful for stating that Mohand is a 異父兄弟.
    Tatoeba #10737738 by small_snow, translation #1744831 by Djef_Messaoudi
  • 1 more sentence on Tatoeba

Example conversation

Yui and Kenta are looking at an old family photo.

  1. 結衣 Yui

    この人は誰?
    Kono hito wa dare?
    Who is this person?
  2. 健太 Kenta

    僕の異父兄弟だよ。
    Boku no ifu kyōdai dayo.
    He is my half brother.
  3. 結衣 Yui

    そうなんだね。
    Sō nanda ne.
    I see.
  4. 健太 Kenta

    たまに会っているよ。
    Tama ni atte iru yo.
    I see him once in a while.

Sources

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Blake Claude
Blake ClaudeHelp make this guide better. Spot a mistake, know another way to say it, or have an example from real life? Share it below.
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