lineage vs family line

lineage and family line both are nouns.

Word	Noun	Adjective	Verb	Adverb
lineage	Yes	No	No	No
family line	Yes	No	No	No

As nouns, family line is a hyponym of lineage; that is, family line is a word with a more specific, narrower meaning than lineage:

Other hyponyms of lineage include family, folk, kinfolk, kinsfolk, phratry, sept, side, breed line.

lineage (noun)	family line (noun)
inherited properties shared with others of your bloodline	people descended from a common ancestor
the hereditary derivation of an individual
a rate of payment for written material that is measured according to the number of lines submitted
the number of lines in a piece of printed material
the kinship relation between an individual and the individual's progenitors