David Page 
They Were the Worst of Enemies [EPUB ebook] 

This is a story about two young girls whose lives are as different as night and day. Debbie is from a loving, well-to-do family, whose parents dote on her, being she an only child. Lisa is the only girl out of five children. She has two older brothers, Duane and Jimmy; a twin brother, Adam; and a younger brother, Sammy. Her father owns a large farm and drives a truck to deliver farm equipment for the local tractor and supply company in town. Lisa’s mother passed away when she was very young, causing her father to go from a kind, loving father to a mean and hateful person. Her second older brother suffered a severe head injury, which turns him into a sadistic person especially toward his sister.

The first time Lisa and Debbie meet on the first day of school, they clash. The feud between them only grows worse as they get older. Then after they turn thirteen, there is a chain of events that turn their lives upside down. And it changed their lives in ways they could have never imagined.