To recap:
Kattarin is missing. One of her children is dead, as are his own children. One of her her other children has declared for her enemies, and others are also missing dead or imprisoned.
Vampires manipulated the Grasping Claws, who manipulated the Bohka to throw the country into civil war.
Now we know that vampire group B rescued Kattarin from vampire group A (who wanted to turn her into a vamp), but then lost her directly to the Skaven (who want to turn her into a mutant skaven slave thing).
Is anything missing or incorrect?