 The purpose of this study is to better understand the genetic causes of Hodgkins disease a kind of lymphoma and non-Hodgkins lymphoma, as well as multiple myeloma, leukemia, and related diseases. The doctors have identified the patient because 1 they have had a lymphoproliferative disorder such as lymphoma, leukemia, or multiple myeloma, and have a family member with one of these disorders or 2 they are a member of a family with a lymphoproliferative disorder, including Hodgkins disease andor, non-Hodgkins lymphoma or a second cancer after Hodgkins disease. 