Hello!
I'm looking for these soundtracks specially the one from Oniisama e../Brother, Dear Brother.

Well thanks a lot in advance I would really appreciate any download link.

I think that never got a CD release. There are four tracks available on the best of CD "Hane-Ken Land" (http://www.amazon.co.jp/%E3%83%8F%E3%83%8D%E3%82%B1%E3%83%B3%E3%83%A9%E3%8 3%B3%E3%83%89~%E7%BE%BD%E7%94%B0%E5%81%A5%E5%A4%AA %E9%83%8E-%E3%81%9D%E3%81%AE%E6%98%A0%E5%83%8F%E9%9F%B3%E6%A 5%BD%E3%81%AE%E4%B8%96%E7%95%8C~-%E7%BE%BD%E7%94%B0%E5%81%A5%E5%A4%AA%E9%83%8E/dp/B0000AVT52/ref=sr_1_6?ie=UTF8&qid=1358610741&sr=8-6).

Try asking here (http://forums.ffshrine.org/f91/only-old-anime-osts-bgm-einachi-67259/183.html). I think it got shared there once. Good luck!