@SUZUKI I don't think that's want they meant, when they refer to half blood it probably means that he is illegitimate meaning that his mom and dad aren't married, while in the twins case is different since yes Beatrice(Chloe ) used to be a slave and an illegitimate princess, her husband is the father of her children so they wouldn't be half blood since their parents are together, it wouldn't matter if they were both commoner or noble if they had a child without being married the child would be called half blood. Hope you understoo