You might also have seen something called a decision tree (such as the algorithm for deciding whether a series converges or diverges). If you trace the tree back from you to that common ancestor, then down through your other grandparent, you would have a cycle, and thus the graph would not be a tree. So far so good, but while your grandparents are (probably) not blood-relatives, if we go back far enough, it is likely that they did have some common ancestor.
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