Authorizing the housing finance agency in consultation with the interagency task force on homelessness to establish a school stability demonstration project under the family homeless prevention and assistance program to secure stable housing for families with school age children and for unaccompanied youth, defining unaccompanied youth; requiring HFA grants to family homeless prevention and assistance projects in communities with schools with significant degrees of student mobility, specifying demonstration project requirements; authorizing use of the grants to acquire, rehabilitate or construct transitional or permanent housing; specifying certain grantee advisory committee requirements; appropriating money to the housing development fund for project administration purposes (mk)