Inclusion Criteria:

* Age: less than 75 years
* The patient must be approved for transplant by the treating transplant physician. This includes completion of their pre-transplant workup, as directed by standard Dartmouth-Hitchcock Medical Center (DHMC) Standard Operating Procedure (SOP) (DHMC SOP - Pre-transplant Evaluation of allogeneic recipient (Appendix).
* The patient must have a disease (listed below) with treatment-responsiveness that the treating transplant physician believes will benefit from an allogeneic stem cell transplant. The diseases include:
* Acute leukemia - Acute Myeloid Leukemia, Acute Lymphocytic Leukemia
* Chronic leukemia - Chronic Myeloid Leukemia, Chronic Lymphocytic Leukemia
* Myelodysplasia
* Myeloproliferative disorder
* Myelofibrosis
* Lymphoma - Non-Hodgkin's Lymphoma or Hodgkin's disease
* Plasma cell disorder, including myeloma, Waldenstrom's Macroglobulinemia
* Donor availability- the patient must have an identified RELATED haplo-identical donor
* No Human Immunodeficiency Virus infection or active hepatitis B or C
* Eastern Cooperative Oncology Group performance status: 0-2
* Diffusing capacity of carbon monoxide (DLCO) greater than or equal to 40 % predicted
* Left ventricular ejection fraction greater than or equal to 40%
* Serum bilirubin \< 2x upper limit of normal; transaminases \< 3x normal at the time of transplant
* No active or uncontrollable infection
* In female, a negative pregnancy test if experiencing menstrual periods
* No major organ dysfunction precluding transplantation
* No evidence of an active malignancy that would limit the patient's survival to less than 2 years. (If there is any question, the PI can make a decision).

Exclusion Criteria:

* Psychiatric disorder or a mental deficiency of the patient that is sufficiently severe to make compliance with the treatment unlikely, and making informed consent impossible.
* Major anticipated illness or organ failure incompatible with survival from bone marrow transplant.
* History of refractory systemic infection

DONOR ELIGIBILITY

* Human leukocyte antigen (HLA) haplo-identical matched related.
* The donor must be healthy and must be willing to serve as a donor, based on standard National Marrow Donor Program (NMDP) guidelines and DHMC SOP - Donor Evaluation (Appendix)
* The donor must have no significant co-morbidities that would put the donor at marked increased risk
* There is no age restriction for the donor
* Informed consent must be signed by donor

DONOR EXCLUSION CRITERIA

* The NMDP guidelines for exclusion criteria will be used (Appendix). In addition, the following donors are NOT eligible:
* Pregnant or lactating donor
* HIV or active Hep B or C in the donor
* Donor unfit to receive G-CSF and undergo apheresis
* A donor with a psychiatric disorder or mental deficiency that makes compliance with the procedure unlikely and informed consent impossible