User blog comment:B214/High School DxD EX/@comment-187.195.251.49-20160122185427/@comment-25262334-20160123045050

Children know Sona very well, so she is probably part of "family". But they call her "Lady Sona" rather than "Sona-kaasan" which implies that she has no baby so far. On other hand they had not even considered her as woman (due not having big breasts like rest of mothers), but that apparently recently changed "for some reason". Interpret it as you like.