A blood relationship exists between two people The degree of consanguinity refers to how closely the two people are related This may be a factor when close relatives marry Related Topic: Relationship Chart
The relation of persons by blood, in distinction from affinity or relation by marriage; blood relationship; as, lineal consanguinity; collateral consanguinity
the degree of relationship between persons who descend from a common ancestor A father and son are related by lineal consanguinity, uncle and nehpew by collateral sanguinity