User blog comment:B214/Question and Answers 2/@comment-117.196.181.215-20140224174554/@comment-1359322-20140225022518

Millicas would undoubtedly be the Clan Head cause the official Clan Head lineage is from Sirzechs not Rias, Rias only became one because Sirzechs couldn't become the Clan Head, so the lineage would continue on Millicas and Millicas' children and Grandchildren etc.