OUTLINE: Patients receive total body irradiation (TBI) three or two times a day on days -8 to -5. Following TBI, patients receive thiotepa IV over 4 hours daily on days -4 and -3 plus cyclophosphamide IV over 1 hour daily on days -2 and -1. Antithymocyte globulin is administered by IV over at least 4 hours on days -4 to -1. Patients undergo an allogenic bone marrow transplantation on day 0. Bone marrow is harvested from patient's donor, depleted of T-cells, and infused. Patients receive filgrastim (G-CSF) subcutaneously beginning on day 4.