Just my silly hypothetical on a certain part of the Bible involving fallen angels, humans, ancestry and nephilim.

I am not Christian outside of hoodoo practices. This is a hypothetical, my brain just got curious and I like questioning the Bible even on nonsense.

So after recently learning more about certain African and non white practices usage of demonic/negative entities, how similar it can be to spirit guide/ancestral usage' for personal growth. It made me wonder if there's rare occasions of a demon or similar like spirits themselves being an ancestor/guide instead of the usual religious assumption of it's a demon replicating them or controlling them to trick us.

So I thought for a second and opened that Bible again. Correct me If I'm wrong.

I understand that Christianity doesn't believe that demons/fallen angels ever had human spirit, which is true for that time, angels were created by God. So by biblical law they can't be ancestors, not to humans at least, in the Bible human spirit is human spirit negative or not.

But if we were technical and decided to believe in every Bible teaching, then in a hypothetical world, God sending demons to the human plane, pierced the veil that he created in the first place. We could also say giants and other nephilim that were produced by humans and fallen angels are ancestors to their descendants?

And in a way that would make those same "demons"/fallen angels part of an ancestorial lineage aside from the daughters of men? So if there's people alive today that are descendants, they can technically say that they have demons that are ancestors? Or just ancestorial lineage that works completely different than the human spirit?