Romantic or sexual relations between non-blood relatives (e.g. step-parent with step-child or step-siblings).

This also applies to uncle and niece, aunt and nephew, etc. relationships if they're confirmed to not be related by blood (e.g. the uncle is the step-parent's brother).

See also

• incest
• step-siblings
• step-parent and step-child
• adoptive parent and adoptive child
• adoptive siblings

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