Degrimm posed the question as to whether Adalind's and Nick's life choices might make them abominations in the eyes of fellow hexenbiests and grimms. That could be the reason why hexenbiests do not live with humans, or other hexenbiests, or even grimms, as novel as that may be. I myself suspect Adalind's not the first to taste the forbidden fruit though, but I digress. To avoid the danger of a complicated and (no doubt repulsive relationship in the eyes of her kind), perhaps the hexenbiests make the decision to take their children and raise them themselves.
The best way to frustrate a cyberbully is to ignore him.