Responses
Aniue is the respectful term for Brother. 兄上, 兄 for brother, 上 for above.
Ani/Onii is the term used to call older brother and Ane/Onee is used for older sister.
For older sister it's Aneue
Isn't Aniue big sister? That's obviously an uke no? A male? Shouldn't it be aniki?