I tried this a little while ago, and now I'm back to try it again...
We'd need:
Mother: Kuno?
Father: Chree?
Son(oldest): CrazyIvan
Daughter(Oldest): Nyarly
Fraternal Twin 1: played by me.

Fraternal Twin 2(Female): Zillah?
These are the current spots, and as you can see, they have been potentially filled. However, if they are no longer interested, the spots will re-open, so keep tabs, everyone who is interested..I've PMed everyone on the list to see which ones are still interested.
The Twins are the youngest of the family, at 16.
So...anyone interested? o-o