Charles was the son of the Squire and the brother of Elizabeth.
After saying goodnight to their servant Ralph, Charles heard Ralph scream. He went to investigate and fired a shot from his firearm that wounded thd Terileptil that had killed Ralph. The shot attracted his father's attention, and he killed it.
Shortly afterwards, Charles, his father and Elizabeth were all killed by the Terileptil's android. (TV: The Visitation)