In many systems, parallel cousins are called by the same term as EGO's biological siblings. This means that:

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In many cultures, parallel cousins (children of a father's brother or a mother's sister) are considered almost as close as siblings, and thus, relationships between them may be subject to the same social rules and taboos that apply to biological siblings, including incest taboos. This does not necessarily mean they are biologically the same, live together, or are in the same descent line.

In Many Systems, Parallel Cousins Are Called by the Same