Young Jane Young by Gabrielle Zevin has several narrators and shows how one bad choice can affect a whole family. While most of the "voices" sounded similar, Gabrielle Zevin throws in a lot of zingers and humor. The parts I enjoyed the most were the e-mails that Ruby sent to her Friends Around the World pen pal, Fatima, a Muslim living in Indonesia.
From the cover:
Aviva Grossman, an ambitious congressional intern in Florida, makes the mistake of having an affair with her married boss. When the affair comes to light, the popular congressman doesn't take the fall, but Aviva does, and her life is over before it hardly begins. . . she sees no way out but to change her name and move to a remote town in Maine. . . When she decides to run for public office, that mistake trails her via the Internet and catches up. It is only a matter of time until Ruby finds out who her mother was and is forced to reconcile that person with the one she knows.