Find the lowest common ancestor (LCA) of v and w given a DAG and two vertices, v and w. The LCA of v and w is a v and w ancestor who has no v and w ancestors who are also ancestors of v and w. Finding the degree of inbreeding in a pedigree graph and other applications involving genealogical data analysis and multiple inheritance in computer languages both benefit from computing the LCA. Hint: In a DAG, define the height of a vertex as the distance along the longest path from a root to the vertex. The tallest vertex among those that are both v and w's ancestors is an LCA of v and w.

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