[She has a hard time calling Washu her mother much less anything more. Complicated relationship.]

Ree-oh-oh-kee.

Does any sibling really do? [Other than the eyes, yeah pretty much different.]
I can do it, but math is boring so I don't bother with it.

Oh, now that you mention it...well, not sure if it was part of you hallucinating or what, but did you ever find your brother Shizuo?