in lover avenged, it is revealed that the princess in rhev's half sister...really? 의해 blood 또는 as a fellow symphath? he's going through enough hell without adding incest to the mix.
They are brother and sister 의해 blood through their father who was the Sympath king. Although the princess is full sympath Rhev is half vampire through his mother who was raped 의해 the king.
Rehv and the Princess share the same father, Rehv's mother, a fallen chosen, was raped before she married Bella's abusive father. This added dynamic, (incest) helped make Rehv sacrifice for his family that much greater.