[RL] Dynasty creation is restrictive for no reason

I mean, there is no clear principles of who can be added. I can freely add vampire offsprings of a spouse of my sim, as well as her real or fake children, but I cannot add her siblings or further. 

I am quite tired of juggling with dynasty leader title back and forth just trying to add members to the dynasty. In the end, I'm still able to add everyone I want, including sims completely unrelated to the family (through faking genealogy). So there is no reason at all to make such restrictions. It makes creating dynasties difficult with no purpose. I believe this is a bug with the game being unable to correctly interpret family relations. Every sim either related by blood, marriage and fake connections should be able to be added.