It's Not the End of the World - Blume, Judy

Karen's parents have always argued, and lately they've been getting worse. But when her father announces that they're going to get divorced, it seems as if Karen's whole world will fall apart. Her brother, Jeff, blames their mum. Her kid sister, Amy, asks impossible questions and is scared that everyone she loves is going to leave. Karen just wants her parents to get back together. Gradually, she learns that this isn't going to happen - and realizes that divorce is not the end of the world. It's Not the End of the World is Judy Blume's classic young adult novel about family separation.