Family business (4)
I believe this clue is a double definition.
'family' is the first definition.
(one's lineage)
'business' is the second definition.
(as in someone's line of work)
(Other definitions for line that I've seen before include "Policy - file" , "Long mark; direction" , "job" , "It's long relative to its width" , "dash one end to the other" .)
(Other definitions for owned that I've seen before include "Confessed" , "Had possession of" , "admitted making confession" , "Acknowledged" , "fully paid off?" .)