Are aunt and nephew related by blood?

Aunt and nephew are related by blood. If they are related by blood, they are related by blood.

Blood relatives are divided into direct blood relatives and collateral blood relatives. Lineal consanguinity refers to a relative who has lineal consanguinity and is consanguineous with himself; Brothers and sisters, cousins, uncles, aunts, nephews and other peers, elders and younger generations are collateral blood relatives.

Blood relatives mainly refer to the same ancestor, blood relatives, that is, natural blood relatives; It also includes blood relatives fictional by law, that is, relatives who are not related by blood but are legally recognized as having the same rights and obligations as natural blood relatives, such as adoptive parents and adopted children, stepparents and stepchildren raised and educated by them.

Extended data:

Immediate family members, biological parents and grandparents counted from themselves are immediate blood relatives of the elders. The biological children, grandchildren and grandchildren counted down from themselves are all direct blood relatives of the younger generation, and they are relatives of the same ancestry; Brothers and sisters, cousins, uncles, aunts, nephews and other peers, elders and younger generations are collateral blood relatives.

The blood relationship between natural blood relatives and fictional blood relatives based on real blood relatives is natural blood relatives; If the relationship is adoption (for example, between adoptive parents and adopted children), although there is no real kinship, once adopted, it is legally recognized as consanguinity, which is a fictional consanguinity and has the same legal effect as natural consanguinity.