line of descent (
http://definr.com/line of descent)
n 1: the kinship relation between an individual and the
individual's progenitors [syn:
descent,
lineage,
filiation]
2: the descendants of one individual; "his entire lineage has
been warriors" [syn:
lineage,
line,
descent,
bloodline,
blood line,
blood,
pedigree,
ancestry,
origin,
parentage,
stock]