血缘 (xuèyuán): blood relationship

Measure Word

一种血缘 zhǒng

Literally 'blood connection' — blood relationship

Tāmen zhījiān yǒu xuèyuán guānxì.

They are related by blood.

Xuèyuán bìng bùshì qīnqíng de wéiyī niǔdài.

Blood ties are not the only bond of family affection.

usage

血缘 refers specifically to biological/genetic kinship. For non-biological family bonds, use 亲情 (qīnqíng).

血 xuè

缘 yuán