User blog comment:B214/Volume 17 spoilers./@comment-187.209.0.247-20140306224029/@comment-16281343-20140312071830

It's kinda like the whole Gremory Family went with the flow. Grayfia wants them to treat her as a maid (and gets kinda angry when they don't) but clearly she isn't listed as one of the maids since she is the wife of Sirzechs.