It should be noted that in ancient Peru and Hawaii, royal endogamy was permitted despite the restrictions on sibling incest, therefore, this is logically true.
Endogamy simply means a practice of marrying within one's group, caste, or royal family.
Royal endogamy occurs in some societies as it based on brother-sister marriage. It is similar to caste endogamy. In ancient Peru, Egypt, and Hawaii, one can marry their siblings
In conclusion, the statement is true.
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