Well firstly the main character e.g you is the decendant of the furtive pygmy.
Also little fun fact about Prisilla crossbreed is actually the daughter of Gwenevere and Seath the scaleless.
and sadly no it wasn't illusions guys although I would've loved that twist
None of those are really facts though just theories but many people do believe like those theroies but i dont really agree with them. Like for instance, Priscilla could actually be Gwynevere's daughter because we have never actually seen her husband so it is entirely poissible that Flame God Flann was a dragon or a relative of a dragon i mean when you think fire you think dragon, i know its a massive leap but it could be possible.
There arent many facts in dark souls but the illusion is one thing that is actually a fact and is proven. So unless you have anything like a youtube clip or a item description to prove any of that then its really just a theory.
And yes i do think we are decedants of the furtive pygmy but i think thats because we are human and all humans are decendants of it.