User blog comment:B214/Volume 23 discussion blog/@comment-77.188.244.180-20170422191737/@comment-23853100-20170423064637

Being a servant doesn't overrule Ravel's past. Even now Ravel is still a High-class Devil and part of the Phenex/Phoenix. The reason why Ravel is no longer a Phenex in the future is because she married Ise.

Like how Venelana and Misla had to change their last name upon marriage, Ravel would have to do the same. But Ise isn't a real Gremory, he's the Gremory's son-in-law. So naturally Ravel can't adopt the Gremory name and had to use the Hyoudou name.

Leaving the house doesn't mean losing your status or you cut connection with your original family, leaving the house here means marrying into your spouse's family.