The graph does not distinguish between parents and children, or aunts/uncles and nieces/nephews.
For these non symmetrical relationships the relationship of the person from the most recent generation is displayed (I.e. Cousin marriage is important in several anthropological theories which often differentiate between matriarchal and patriarchal parallel and cross cousins.
At least one set of one person's great-grandparents are the great-great-grandparents of the other person.
A "table of consanguinity", is helpful in identifying the degree of cousin relationship between two people using their most recent common ancestor as the reference point.
This means neither person is an ancestor of the other, they do not share a parent (siblings), and neither is a sibling of a common ancestor (aunts/uncles and nieces/nephews).