Mildred Taylor, specifically Roll of Thunder, Hear My Cry
Donald Duk by Frank Chin (may be more appropriate for 12/13)
The Absolutely True Diary of a Part-Time Indian (Pretty accessible, but I can't remember whether there was any profanity or not. Knowing Alexie, there probably was.)
M. C. Higgins the Great by Virginia Hamilton.
Give me a couple of months and I will have another title for you. 