You are all 100% human, born of two 100% human parents, as was their parents before them, and their parents before them, and so on and so forth.
There are no such things as “Fae”. The Fae, Fairies, Fair Folk, Twyleth Teg, Sidhe,Tuatha deDanaan, etc. are all derived from the ancient meeting of disparate and different tribes of humans. Most of the legends come from Ireland, where the settlers moving into the area were fair and tall compared to the natives who were shorter and dark of hair. This has become distorted down through the centuries in the myths of the Tuatha and the Firbolg, who may have actually been the surviving remnant of Neanderthal man. We know from DNA testing that the genetic legacy of Neanderthal man is present in and disseminated throughout modern human lineage, proving that the Neanderthal heritage was recessive compared to the Dominant genetics of HomoSapiens, and thus also proving that we assimilated them through interbreeding.
The Tuatha, or Fair Folk conquered the Firbolg, and over the years assimilated them through warfare and intermarrying, with the genetic code of the newcomers being Dominant. Much later other tribes moved into the area, and the process was repeated, except that the new tribes immortalized the Tuatha as “elves” or the Fair Folk, and even though they were either beaten in warfare or assimilated in interbreeding the newcomers found it to be much more pleasing to pretend in stories that the Fair Folk had retreated into “faerie mounds” or vanished into other worlds.
The legends were also colored by the inclusion of ideas from other Germanic/Norwegian tribes, whose stories of Asgard incorporated tales of short dwarves who lived in underground cavern kingdoms and tall, graceful elves, or Alfar, who lived in the otherwordly realm of Alfheim and were ruled by the god Frey.
Over the centuries Man spread throughout England and Ireland, building roads, villages, farms, cities, etc. and encroaching more and more on the land. The savage and wild corners of the maps were slowly filled in, and as it became apparent that there were no “elf” cities just over the horizon, or deep in the forests, we relegated them to being under the hills, in subterranean realms of wonder. Gradually we shrunk the elves in our tales, and the tall Alfar or Tuatha disappeared from our stories, replaced by tiny pixies, sprites, boggans, etc.
The faeries are nothing more than the watered down, corrupted legends of ancient man, born from a time when the tribes of Man were different enough that each group thought that the other was something supernatural or alien 1 month ago