User blog comment:B214/Question & Answers 5/@comment-178.128.187.173-20150913083722/@comment-1359322-20150913115357

Ise's marriage with Rias is the Gremory's thing it has nothing to do with the Bael. He probably said that as a great-great-great grandfather or something. Rias, Sirzechs and Millicas are considered his descendants too,