WordNet sense 1 (the kinship relation between an individual and the individual's progenitors):

lineage, filiation, lineage, line of descent

WordNet sense 2 (a downward slope or bend):

declension, declination, decline, declivity, fall, downslope

WordNet sense 3 (the descendants of one individual):

ancestry, bloodline, blood, line, origin, parentage, pedigree, stock, stemma

WordNet sense 4 (properties attributable to your ancestry):

extraction