He'd need to have kept at leats one, right, as his heir? I've always figured that Plan B had Luken's children (and possibly grandchildren) as 'free agents' --- taking care of the ships, maybe? After all, Korval owns more than Dutiful Passage; surely those other ships need captains and crews, why shouldn't Luken's heir/grandchildren be one one or more of those ships?
Though I *have* wondered why Anthora didn't mention them, when she's checking on the clan, after Plan B has been declared ...