The Collection is military faction that enslaves those not born into their ranks and exterminates those who’ve tried to escape. While serving the resistance Claudia returns to her hometown to find her brother Deitrich, orphaned and alone. She deserts the command to take him to a rumored safe heaven, but now she must avoid capture from both the collection and the resistance force.

And you could weave in the concept that 'the born into' lineage is maternal only so that it is a half brother she is saving.

Your edit made me think of something. What if she is apart of the Collection and finds her brother marked for extermination and defects from the collection?

I agree that I should shorten it, and I like the idea of leaving out so much info on the collection because I want it to be revealed. I'm curious as to how engaging the story seems at this point. I would appreciate any feedback