"They chose Giedi Prime as their home," Leto said. "What does that suggest?"
"It was a Harkonnen stronghold, but that's ancient history."
"Your sister died there, a victim of the Harkonnens. It is right that the
Harkonnens and Giedi Prime be united in your thoughts. Why did you not mention this earlier?"
Now I remember Gurney's sister was killed there but was Duncan's sister also killed there? To be honest I can't recall her at all.