WordNet sense 1 (the place where something begins, where it springs into being):

beginning, root, source, rootage

WordNet sense 2 (the descendants of one individual):

ancestry, bloodline, blood, descent, line, lineage, parentage, pedigree, stock, stemma, lineage, line of descent

WordNet sense 3 (an event that is a beginning; a first part or stage of subsequent events):

inception, origination

WordNet sense 4 (properties attributable to your ancestry):

extraction