The younger brother of self-confessed D.C. tax scam mastermind Harriette Walters is off to prison, having pleaded guilty to helping his big sister siphon off millions in the city’s largest-ever public corruption scandal.

U.S. District Judge Alexander Williams Jr. sentenced Richard Walters to more than four years behind bars and three years of probation for his role in the $48 million, decades-long scam.