Patent US 4,865,548

A three-dimensional family tree system displaying family relationships, including lateral lines such as aunts, uncles and cousins, comprises a number of transparent planes in a vertical assembly, one plane for each generation, each plane vertically separated from the planes above and below it by sufficient distance to allow the placement, on each plane, of a number of individual markers. To each marker is affixed the name of a family member of that generation, and each of said markers is connected by a line to the marker or markers for the said family member's parents on the plane above, and, as appropriate, by lines to one or more markers for the said family member's child or children on the plane below.