Looking to find which book or series of books that center around three descendants of some powerful person, who take on human bodies and each have their special respective powers. The characters are part human with these ancient warring children's personalities and powers superimposed on them. Two are male, one is female. The protagonist male is named Alan, I believe, who is a traveler and can find his way through any tangled maze or impossible to navigate terrain. His brother's name starts with a H, maybe Hadan or something, and has special powers with fire. The sisters name I forget, but she has special powers with water.
Does anyone know what this is?