I have been trying to breed the genious trait into my line for almost 200 years, in 2 seperate games with zero success. Since i never get the trait on my heir, it's always dependent on the mother. However i did notice some of my close relatives started to get genious children, and the odd thing was, that in both cases, the father had no trait, but the mother was "Attractive" or whatever it's called.
So I'm wondering, if the combination of a possible "genious" line Ie.
Mother is Genious
Father has no traits
Child with no traits marries "attractive" woman.
-> their children has a high chance of genious.
This is just a very loose theory that i havn't tested yet, but if others want to give it a go.....