My records might not be as extensive as the Sisterhood's Genetic Index, but I used what we learned from the TV show and added the prequel books it's based on to construct a full family tree. Hope you have fun swinging through its branches.

A few things I found interesting

• Vorian Atreides is still alive (due to sci-fi life extension treatments he got thanks to his dad, who used to work for the Omnius evermind)
• Keiran Atreides is Sister Lila’s 4th cousin once removed (both being descendants of Vorian)
• Valya and Tula are 3rd cousins of Javicco Corrino, which means Desmond and Harrow are both 4th cousins with Constantine and Ynez (all are descendants of Wandra Butler, Xavier Harkonnen’s youngest daughter)
• Tula is the aunt of not only Harrow but Keiran as well

For those who'd like to see it in high resolution, I'm attaching a PDF:

DuneProphecyFamilyTree-highres.pdf (884.44 KB • PDF File)