The situation is exactly what the anon above me said: I'm afraid you're not able to nominate a poly relationship with this level of specificity, so either:

1) go with Aaeru/Neviril/Paraietta and say you'd also be interested with a poly V where Aaeru and Paraietta aren't involved with each other
or
2) request the component relationships individually and mention that optionally, you'd like them in a poly relationship without the Aaeru/Paraietta component

Sorry - relationship matching in this exchange just isn't geared up to specify poly ships in this manner.