実弟
Meanings
1
biological younger brother
Used to specify a younger brother by blood, as opposed to a brother-in-law or stepbrother. Often used in formal or explanatory contexts.
He is my biological younger brother.
My biological younger brother is getting married.
Usage patterns
- 〈人〉の実弟にあたるto be someone's biological younger brother
He is the biological younger brother of the famous actor.