Leb wohl, mein Bruder.
Auf Wiedersehen, mein Bruder.
Note. This sounds rather solemn.
To say "Goodbye" in Bavarian German you would say AufWiederschaun, in contrast to standard German which is simply Auf Wiedersehen.
The people of Switzerland speak many languages including; German, German-Swiss and Italian. One of the most popular ways to say "goodbye" in German is "Auf wiedersehen".
Sag nicht Aufwiedersehen
How do i say i have a brother and a sister in German ?
Because she's going to a sleepover-not a big thing. And why would she say goodbye to her crush or brother-would they have really cared?
to say goodbye, e.g.Wir haben uns am Bahnhof verabschiedet - we said goodbye at the train station
Halb-Bruder
Because it is just a sleepover and it is no big deal. A goodbye is not really required.
That would be 'Sayonara Nii-san' if they are older. There are many different ways to say older brother, I chose nii-san since I believe it to be the most common. If it is a younger brother one would say 'Sayonara Otouto' Both of these simply read 'Goodbye Brother' because in Japanese words like my are understood.
Hello-Hallo Goodbye-Auf Wiedersehen School bus-Schulbus Library - Bibliothek
Bruder und Schwester
In French it's Au revoir "¡Adiós!", en español