Wilhelm van Astrea/Relationships

Heinkel Astrea
Wilhelm's relationship with his son is heavily strained, especially since his wife died while on the Hakugei expedition, something that she took on because Heinkel refused to do so.

Reinhard van Astrea
Wilhelm's relationship with his grandson is very tense, likely because Reinhard inherited his wife's power as the sword saint just before she died, making her much weaker than she was at her prime. Nevertheless, Wilhelm did wanted to fix their relationship after the Hakugei was successfully killed. However, after Reinhard was forced to kill Thearesia's resurrected corpse, Wilhelm asked his grandson if he had any regret doing so. After hearing Reinahard's answer, he begins calling the current Sword Saint by his full name, showing that he sees him now as a stranger rather than his grandson.