にくしん肉親nikushin
1.

A person who is closely related by blood, such as a parent or sibling, emphasizing the emotional bond that often accompanies such relationships.

2.

An individual with whom one shares a direct genetic connection, highlighting familial ties and the significance of these relationships in personal identity.

3.

A family member connected through lineage, underscoring the deep-rooted ties that may influence familial loyalty and affection.

Example:

人々は行方不明の肉親の知らせを気にかけていた。