I don't know about any of Du who may read this, but I want to know about Moka's family. Judging from Moka-sama(when I say -sama I ALWAYS mean inner Moka) and her sister's that we have been introduced to, Kokoa and Karua, their family life MUST be a little...different. The one I'm dieing to know about is the last sister, the eldest. The sisters seem to grow extremely Mehr powerful from the youngest to oldest. I'm practically jumping out of my sitz to know the last. I don't know if anyone for sure knows her name oder what she looks like but I'm been Lesen fanfictions about R+V and found one I really like. It's called The Mighty Vampire Aono Von Lord of the Land of Fire. link
(!WARNING! That story is rated 'M' for mature. It's not for children to read. It contains not only zitrone but lemonade.)
In that story the last sister is a major character and is name Ria. I'm still not positive about what she looks like from the author's Beschreibung but this story is really great and gives a whole new way to think about the relationship between Moka-sama and Tsukune.