Pronunciation: blŭd rel′ă-tiv
Definition: A popular term describing a relative of a person sharing a common ancestor. No special importance attaches to the blood as a vehicle of inheritance. Spouses are not ordinarily blood relatives and when they are, the marriage is consanguineous and carries a higher risk than average of progeny homozygous by descent from ancestors in common. Such marriages are discouraged and within certain degrees of kindred may be illegal.