User blog comment:B214/Volume 21 info & spoilers/@comment-3965848-20160501063758/@comment-27876048-20160501202708

@Striker10 you have the relations confused Sirzechs and Rias's mother Venelena Gremory used to Venelena Bael. Her younger brother is the current head of the House of Bael, Sairaorg and Magdaran's father. Sairaorg's mother is from a completely different house that has no blood relation to Bael or Gremory, other than through her son