The mother of rap star Eminem has been sued by a man who claims he helped her to pen a tell-all book about her son but was cut out of the profits.

Neal Alpert claims in an Oakland County Circuit Court lawsuit filed Monday that Debbie Nelson developed the book while she was under contract with him, reports the Associated Press.

The lawsuit alleges they signed a contract in 2005 that called for Alpert to serve as her agent and receive 25 percent of the gross profits.

The book, titled "My Son Marshall, My Son Eminem," has sold 100,000 copies since its U.K. release last year, the lawsuit states. The book is to hit U.S. stores this week.