"जूलिया के भाई"

Translation: Julia's brothers

[VishBhai]

Isnt the plural for भाई, भाइयों ?

[erichiggins95]

Normally, no. In a sentence like this, भाई is an unmarked plural meaning "brothers". In the oblique case, however, meaning when it is the object of a postposition, then all masculine plural nouns regardless of whether they are marked or unmarked take ओं, giving us भाइयों.

So: जूलिया के भाई means "Julia's brothers", but मैं मेरे भाइयों के साथ खा रहा हूँ means "I am eating with my brothers"

[VishBhai]

That's pretty complicated. People often use wrong hindi colloquially. But for example when you say भाइयों और बहनों when you are addressing a crowd, is that also wrong?

And how would you say julia's brother? जूलिया का भाई ?

[aaditsingh8]

Yes, that is how you'd say Julia's brother. When addressing someone, words also take the oblique case. Thus, भाइयों और बेहेनों!

[OJFord]

*Vocative, which happens to be the same as oblique but without nasalising -ओ ending in plurals.

Edit: Your mod badge doesn't show on mobile, but I see it now. Please correct me if I'm wrong, but the above is my understanding from a few sources, incl. Snell & hindilanguage.info

[zeebo7]

Yep! Although a tiny tip that in your example it should be मैं अपने भाइयों, not मेरे

[shrikrishna1]

The plural of भाई ( mas. sing.) is भाई only. While भाइयों is Vocative plural., vocative singular being भाई.

[OJFord]

भाइयो is vocative, भाइयों is oblique.

[Thorsten781499]

Has it somewhere already mentioned when you have to say "ka", "ke", or "ki" ?
What I found out from google translator:
Peter's brother: ka
Peter's sister: ki
Julia's brother: ke
Julia's sister: ki

Is there a general rule for this?

[VishBhai]

There is some explenation here:
https://forum.duolingo.com/comment/28223319

[Kevin353755]

It accepted "Julia's brother" as correct, but looking at it again I think that के indicates that भाई is plural here, right?

[OJFord]

It could mark respect/formality (toward the brother) too.