User blog comment:B214/High School DxD EX/@comment-25262334-20160127143108/@comment-79.50.160.94-20160128004537

Not exactly. We know that Le Fay's son life depends on this mission, but we know that he is a guy (The other childrens talk about him in this way and saying that he could have inherit the holy sword Collbrande it's a gigantic hint that he is the son of Le Fay and Issei), while Ernestine is the female version of Ernest, so this child is a girl. So I guess that Le Fay's son didn't travelled back in time and that this Ernestine is the 10th child. It can't be Kunou since she's japanese and Ernestine is more a European name...