42 Ran is Yustaf's step sister. They are from different dad's and mom. Ran's mom married yustaf's dad. In the original story. Yustaf was treated poorly and their fief succumb in debts but once Yustaf was seated he was able to revive it. Reincarnated Ran decided to help Yustaf and play the role of the head for some time until Yustaf comes of age. She used her knowledge of the events in the future to make the place bountiful until Yustaf legally inherits the title like the mana stones they have in their property to be free later on and avoid the tragic death she had before...
The Viridescent Crown