A family is renting a cabin on an Island, because usually they ignore their kids because of work, and now is time to finally bond. Of course this explains also the fact that the kids are rebellious. As the mother refuses to buy her girl a dog, she now will want an elf and for that she will wreak havoc among the island. We all wanted to free the animals in the zoo when we were little, without a plan for after the gates were open, so I found that plausible. Motherhood is tough and scary so it is easy to forget basic things like making the kids wash their hands after they just killed an Elder. The father is just plain. And of course you would like to take a small elf into the city and not leave it in the woods, so that when it grows and is hard to control, to do what the people usually do when they adopt a small monkey, bear, puma , eagle, turtle etc. I would have found it more interesting for the girl to remain with the elves for balance to be restored, maybe Kee-ko would have helped her survive with them in the woods and the island would have reached balance again. She would have remained the last Guardian of the Island.
