Story
During the Teleport Incident, Philip was teleported into a conflict zone and died there together with his wife Hilda; their bodies were found by Ghislaine. Thus Eris's family was wiped out: Philip and Hilda fell in a war zone, and Sauros was executed for his “responsibility” for the catastrophe.
From the account of the butler Alphonse it is clear that Philip had earlier defeated his rival within the house in the struggle for power, but the political instability following the catastrophe decided the fate of the entire branch.