Since the death of Lambert, Berengar had hidden it from his family. The reason being he was afraid of the effect such news would have on his loved ones. More importantly, he did not want them to figure out that he had personally killed his brother in battle and claimed his skull as a drinking cup. This barbaric act was Berengar's final revenge on his little brother for the boy's wicked actions.
However, he could not keep the secret forever, and thus Berengar had been hatching a scheme to inform his mother, father, and little sister of Lambert's death. He had just been too busy up until this point to do so.
However, with his schedule free for the next few days, Berengar knew the time had come to announce Lambert's death and allow his family to have a good image of their lost loved one in their hearts and minds. As such, he had recently sent out a summons to his parents so that they may appear in Kufstein.
