John Parry's father was a seemingly-elderly man from Will's world. When Will Parry was six years old, he visited his grandparents' large house with his mother, Elaine Parry. They gave them a cold welcome and left Elaine in tears. Will hated people who treated his mother like that and, wanting to kill them, he tried to make sure his mother was never faced with that brutality again. He didn't realise they were his grandparents until he was older.
- The Subtle Knife (Mentioned only)