English version

blood relation

From Longman Dictionary of Contemporary Englishblood relationˈblood reˌlation (also blood relative) noun [countable]  FAMILYsomeone related to you by birth rather than by marriage
Examples from the Corpus
blood relationHe could be the next-door neighbour, a friend, a blood relation.The midwife toad has a blood relation, the northern midwife, much alike in appearance.
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