Incest (/ˈɪnsɛst/ IN-sest) is human sexual activity between family members or close relatives. This typically includes sexual activity between people in consanguinity (blood relations), and sometimes those related by affinity (marriage or stepfamily), adoption, clan, or lineage.

What is the word for marrying a family member?

Consanguine marriage is marriage between individuals who are closely related. In a clinical sense, marriage between two family members who are second cousins or closer qualifies as consanguineous marriage.

What are the family relationships?

What Constitutes a Family? Family members can be related by birth, marriage, or adoption. Your immediate family includes parents, siblings, spouse, and children. And your extended family includes people you are related to, such as grandparents, cousins, aunts & uncles, nephews, nieces etc.