Marriage

====Kinship====
{{Main|Cousin marriage}}
{{See also|Coefficient of relationship}}
To prohibit incest and eugenic reasons, marriage laws have set restrictions for relatives to marry. Direct blood relatives are usually prohibited to marry, while for branch line relatives, laws are wary.<ref>{{Cite web|title=State Variations on American Marriage Prohibitions|url=https://www.umanitoba.ca/faculties/arts/anthropology/tutor/marriage/usa-ncst.html|access-date=2021-07-10|website=www.umanitoba.ca}}</ref><ref>{{Cite journal|last=Hafen|first=Bruce C.|date=1983|title=The Constitutional Status of Marriage, Kinship, and Sexual Privacy: Balancing the Individual and Social Interests|journal=Michigan Law Review|volume=81|issue=3|pages=463–574|doi=10.2307/1288509|jstor=1288509|issn=0026-2234|url=https://repository.law.umich.edu/cgi/viewcontent.cgi?article=4662&context=mlr }}</ref>

Kinship relations through marriage is also called "affinity," relationships that arise in one's group of origin, can also be called one's descent group. Some cultures in kinship relationships may be considered to extend out to those who they have economic or political relationships with; or other forms of social connections. Within some cultures they may lead you back to gods<ref>{{Cite journal|last=Campagno|first=Marcelo|date=2014-08-18|title=Patronage and Other Logics of Social Organization in Ancient Egypt during the IIIrd Millennium bce|journal=Journal of Egyptian History|volume=7|issue=1|pages=1–33|doi=10.1163/18741665-12340012|hdl=11336/33193 |issn=1874-1657|hdl-access=free}}</ref> or animal ancestors (totems). This can be conceived of on a more or less literal basis.