For Stevie Wonder’s nephew, this coming Tuesday needs to be cleared for one important appointment: An appearance in Los Angeles County Court to answer to felony extortion charges involving his famous uncle.

According the Los Angeles Times, Alpha Lorenzo Walker, 38, and his girlfriend, Tamara Eileen Diaz, 38, have been charged with “felony extortion of money and other property from Wonder by ‘means of force and threat’.” The pair were arrested on May 2 by undercover agents posing as representatives of the singer.

The couple apparently threatened to reveal “embarrassing information” about Wonder, Walker’s uncle, unless he paid them $5 million. The suspects later dropped their expectations to just $10,000.

Walker, who is said to work as a contractor, is also being held on a probation violation.

Wonder’s most recent activity was his performance at Queen Elizabeth’s Diamond Jubilee in London earlier this month. Last month, Wonder was honored with a lifetime achievement award at the Billboard Music Awards.

- Jillian Mapes & Michael Verity, CBS Local