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"younger brother" is correct and usable in written English.
You can use it to refer to a brother who is younger than you, or someone else. For example: "My younger brother is always getting into trouble."
Exact(60)
Letter from younger brother (1997).
Relationship with culprit: younger brother.
Jan's younger brother, David Davidsz.
"He's Marcus's younger brother".
Not so his younger brother, Prince Stone.
An older sister and a younger brother.
His younger brother, Jonathan, 22, took bronze.
Kissinger has one younger brother, Walter.
(Mr. Hollender had a younger brother, Peter).
Roddy's younger brother, John, came out.
Her younger brother, Elwen, remained impassive.
Write better and faster with AI suggestions while staying true to your unique style.
Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com