The following contains spoilers for Dune: Prophecy episode 6, “The High-Handed Enemy.”Dune: Prophecy cast and showrunner discuss Desmond Hart’s (Travis Fimmel) parentage reveal ahead of season 2. Led by Emily Watson and Olivia Williams, who portray Valya and Tula Harkonnen, respectively, the Dune prequel series explores the Bene Gesserit sisterhood in the early days and sees them facing a major threat in the wake of the reckoning. Hart, the antagonist in the series, turns out to be Tula’s son. In episode 6, Tula tells Valya the truth in front of an injured Hart.

https://screenrant.com/dune-prophecy-desmond-parentage-effect-valya-tula-relationship-explained-watson-williams/