I just found your website and related instantly to the feeling of not being able to remember a book from childhood. I know you may have a lot of requests right now – I found your website through a viral tweet. I feel like this may bother me forever, so I would love you help. Below I will explain what I remember about the book. I was born in 1996 and read the book in 8th grade / at age 13. It seemed at the time to be a contemporary young adult book, published probably in the 2000’s or 2010’s. I was living in Canada at the time. I’m not sure if that may effect anything. The book was about a young girl who was separated from her psychotic mother. It had a present / past jumping back and forth storyline. She ends up going on a road trip to learn more about or maybe find her mother and discovers through revealed memories the mom had drowned three of her siblings in the bathtub. They all had weird names that were short and maybe one syllable. It was an insane book and I enjoyed it very much. I would looooooooove to find and reread it as an adult.
Lost Classics of Teen Lit: Name That Book! 