2 sentences

1. 他们之间有血缘关系。

   tā​men zhī​jiān yǒu xuè​yuán guān​xi.

   They are related by blood.

   Source: Dong Chinese Dictionary

2. 该部族的所有成员都拥有共同的血缘祖先。

   gāi bù​zú de suǒ​yǒu chéng​yuán dōu yōng​yǒu gòng​tóng de xuè​yuán zǔ​xiān.

   All members of the tribe share a common blood ancestor.

   Source: Dong Chinese Dictionary