H8713; Phase I/II Study of Allogeneic Stem Cell Transplantation for Patients with Hematologic Malignancy, Using Haploidentical Family Donors and Sub-Myeloablative Conditioning with Campath 1H: This study uses a monoclonal antibody, low dose chemotherapy and radiation combined with haploidentical allogeneic stem cell transplantation to treat patients with hematologic malignancies who have already received a stem cell transplant or who also have other complications such as kidney, liver, or heart disease.