Japanese Honorifics Help

[dmasterxd]

Okay, so you know the Japanese Honorifics like -san, -kun, -chan, etc? And you know how most commonly people refer to each other as Surname-san. Well my question to you is what if there are two siblings in the same class. What does everyone refer to the younger sibling as? Given name-san? Help would be greatly appreciated. Please and thank you.

[chocojax]

I'm not a Japanese native speaker, but uh, I think I heard this in an anime once?

I think they just do surname-san for both, unless the relationship between the two is a little less formal. It could be comparable to having two people in a class with the same name as "Jane"?

[Steamgirl]

I'm not a Japanese speaker either, but I do believe the honourifics are to do with the relationship the speaker has with the person, and not the relative relationship to other people. Unlike in English, where officially speaking Miss Surname is used for the eldest daughter, and Miss Firstname Surname for the others.

Nee-san is what a younger sibling might say to his/her older sister.
Nii-san is what a younger sibling might call his/her older brother.

Other people in the class wouldn't call them nee-san or nii-san because they're not the brother or sister of that person. Unless it's because they consider them like a brother or sister and they have a close relationship. Again, not 100% sure if this is the case, but I think that's how it works.

[Taleweaver]

Also, the older sibling is likely not to use any honorifics whatsoever towards the younger sibling, unless the younger sibling would be small enough to be called firstname-chan. -chan is the usual honorific used affectionally for younger, cuter relatives.

[nyaatrap]

It depends on boy or girl, friend or not, and especially age.
Among boys in a same class in high school, honorifics are barely used.
BTW, -kun isn't so often used. I mostly hear -san or -chan, and never use -kun myself.