So my ruler created a bloodline and for some reason my heir did not get the trait but my other children got it. (Lmao was it a secret bastard or something?) So I thought, no big deal, I'll just make a new one on the next generation.

That ruler is now the great-grandfather of my current ruler and I can't make a new bloodline because "no close family is the founder of a bloodline". Is there a way to fix this? Thanks.