Of the many reasons estate litigation can get so expansive (and expensive), family relationships often take a central role. In addition to the depth and complexity of relationships among family members, the sheer number of relationships to investigate and pin down when a claim is raised can make estate litigation particularly toilsome. For an undue influence case, for example, you may want to track down and interview every person who interacted with the testator within a certain period of time before and after the will was executed. At least an undue influence case puts a premium on evidence close to the execution of the will. For some disputes, the relevant time period may stretch decades.