Abstract: One or more genetic family trees are formed that connect a plurality of individuals based on measures of genetic relatedness between the individuals. A plurality of the individuals are grouped into a cluster that comprises those individuals who are genetically related to (1) a target individual according to first data and (2) each other according to second data. The first data comprises genetic relatedness measures for a plurality of the individuals relative to the target individual, and the second data comprises genetic relatedness measures between a plurality of the individuals. The cluster is deconstructed into a tree structure based on the first data, and family tree(s) are iteratively formed based on pairs of adjacent nodes from the tree structure until the nodes are positioned in family tree(s) based on the second data. The family tree(s) can be connected to the target individual based on the first data.