Consanguinity

Noun

 * 1) A consanguineous or family relationship through parentage or descent.  A blood relationship.

Thesaurus
affiliation, affinity, agnation, alliance, ancestry, apparentation, birth, blood, blood relationship, bloodline, branch, breed, brotherhood, brothership, cognation, common ancestry, common descent, common source, common stock, connection, cousinhood, cousinship, derivation, descent, direct line, distaff side, enation, extraction, family, family relationship, fatherhood, female line, filiation, fraternity, house, kindred, kinship, line, line of descent, lineage, male line, maternity, matrilineage, matriliny, matrisib, matrocliny, motherhood, paternity, patrilineage, patriliny, patrisib, patrocliny, phylum, propinquity, race, relation, relationship, seed, sept, sibship, side, sisterhood, sistership, spear side, spindle side, stem, stirps, stock, strain, succession, sword side, ties of blood