Susan Shwartz 
Heritage of Flight [EPUB ebook] 

Humanity is inextricably torn in an interplanetary war that could lead to the death of human society. Project Seedcorn is probably the last and best hope for the human race. A small group of refugees, scraping out an existence on the edge of human-occupied territory, has been given orders to live as though everything were ordinary and there were no war. Now, everyones lives depend on the children.