Now we know why she's really writing that book!
Sources close to Debbie Nelson, Eminem's mother, reveal to PerezHilton.com that she is writing a book about her famous son because she needs money to pay medical bills.
"She's dying of stage 4 breast cancer," a family insider tells us. "She needs the money to pay medical bills and he wont talk to her so thats her open letter to him."
Adds our source, "Em agreed to try to help her pay some medical bills and try to get her insurance but couldnt because of the pre-existing medical condition."