I was thinking it could be a bit of a survivalist society, with the parents' initial goals being to put together their strength, and the heirarchy of the children settled by individual strength and scuffles between them. They could be a comparatively primitive group but value family over all else, even if that's forged more on blood than attachments made between them. The mates of the children must be approved by the founders of the clan.
Possible other suggestions/ideas could be:
Romeo/juliet scenarios with children and their mates. A piratey sort of affair where everyone has their role and the group can often steal, such as other gems' stones. Taking prisoners.
@Fira