I have two older brothers, would both of them be 'Oniisan'?

Question:

I have two older brothers, one is 15 and the other is 17. I usually call the oldest one Oniisan, what would I call the other one?(In japanese) Is there another form of Oniisan that means second oldest brother? or something like that? Thanks :P

Answer:

>Is there another form of Oniisan that means second oldest brother?

No. Just call him as you call the first brother.

BTW, oniisan is too formal. You can call them like,

aniki
niichan
niisan
etc