Lucy and her husband, Steve, have two adult children. Paul is a Principal Software Architect working to improve the efficiency of transportation services in Boston, Massachusetts; his wife, Sarah, is the International Medicine & Business Development Manager for Boston Children's Hospital. Laura is a project manager for LookThink, a company working to improve website user interface experiences for private and non-profit clients; her husband,John, is a physicist for the National Institute of Standards and Technology. Toby is the family German Shepherd, adopted from Virginia German Shepherd Rescue in 2010.

Lucy is learning to speak Spanish and is a volunteer with the Interfaith Works Vocational Services Program in Montgomery County, Maryland. This program prepares clients through job readiness classes, training in computer classes, job preparation and placement, and ongoing support for employment retention success.