Fey aren't 100%t biological creatures the way orcs or humans are, right? They are, at least in part, actually not made of meat. If fey blood enters a bloodline, how many generations does it take before the kids are mundane creatures with odd features, rather than spirits wearing meat?
Fey are formed out of a spontaneous coalescing of magical energy into a sentient and sometimes sapient form, their physical bodies can perfectly mimic normal biological functions depending on the type of fey, but they are basically blobs of intelligent magic which are so good at playing pretend that even they often believe it.
How many generation it would take for fey/mortal offspring to become fully mundane is questionable, but at least two or three.
How many generation it would take for fey/mortal offspring to become fully mundane is questionable, but at least two or three.