I hate to be a stickler but that was more of a "sapling" than a "seedling." While it certainly may have been grown from a seed, it is much too grown to still be called a seedling.
I also wonder what her mother is going to do. I doubt it will be harmful, unless she thinks the other county has harmed her daughter. Otherwise she would be irrefutably stupid.
Also, yes, that man is not his father, that teen is not his brother. He literally has no father as he is an "offshoot" of his dryad mother. His "genetics" come solely from her (and her ancestry).