Last Updated：2025/11/29

A blood relative who shares roughly half a person's DNA, such as a parent, full sibling, or child.

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first-degree relative

Source Word

first-degree relative

A blood relative who shares roughly half a person's DNA, such as a parent, full sibling, or child.

Japanese Meaning

血縁上、直系の近い親族。具体的には親、実兄弟／姉妹、子どもなど、一人のDNAのおおむね半分を共有する関係にある親族を指す。

Because his mother was diagnosed with the condition, he realized he was a first-degree relative at increased risk.

母親がその病気と診断されたため、彼は自分が親や実の兄弟姉妹、子どものようにDNAのおよそ半分を共有する血縁者であり、そのためリスクが高いことに気づいた。

Sense（1）

A blood relative who shares roughly half a person's DNA, such as a parent, full sibling, or child.

first-degree relatives

（ plural ）