LEGACY Act of 2003

Living Equitably: Grandparents Aiding Children and Youth Act of 2003 (Legacy Act of 2003) - Directs the Secretary of Housing and Urban Development to carry out: (1) a five-year pilot program in connection with the supportive housing program to provide assistance to private nonprofit organizations for expanding the supply of intergenerational dwelling units for intergenerational families (families headed by an elderly person); and (2) a five-year demonstration program for section 8 rental assistance to families headed by a grandparent or relative who is raising a child.

Makes grandparent-headed and relative-headed families eligible for: (1) family unification assistance under the United States Housing Act of 1937; (2) Home program ECHO units under the Cranston-Gonzalez National Affordable Housing Act; and (3) fair housing initiatives education, counseling, and outreach under the Housing and Community Development Act of 1987.

Amends the Department of Housing and Urban Development Act to provide Department of Housing and Urban Development personnel with related training.

Directs the Secretary and the Director of the Bureau of the Census to conduct a joint study of such families' housing needs.