IT is a very good intro. You have some foundation that may prove a promising world. Of course it all depends on building of the works rhetoric purpose. Still, expanding characterization and more depth to the world is always a place to go. To the main point of expressing a works purpose occurs through conflict. Often the earlier a conflict presents itself the more apt a reader has to follow it to resolution. Right now you have a ecological balanced system that is stable despite small disputes. breaking such a niche either depends on one such family structure to over turn the others or an outside force doing the same. These are just some ideas to work with, good luck with the rest.