Family row (4)
I believe the answer is:
line
I believe this is a double definition.
'family' is the first definition.
(one's lineage)
'row' is the second definition.
(as in a row of things)
(Other definitions for line that I've seen before include "short note" , "Wrinkle, boundary" , "Row; track" , "cover on the inside" , "Railway track; wrinkle" .)