Patients will be given drugs (cyclophosphamide, fludarabine and cyclosporin) to prevent the donated cells from being rejected and to prevent them from damaging the patient's organs. The thawed stem cells will then be infused through a vein. After 30, 60 and 100 days, bone marrow cells and circulating lymphocytes will be checked to see how many are of donor cell origin. If less than 100 percent are of donor origin, more lymphocytes will be transfused. Patients will have physical examinations and blood tests once or twice a week for 2 to 3 months with and then will be followed periodically for at least 5 years.