User blog comment:IamJakuhoRaikoben/Chapter 386: Galaxia Blade, Review./@comment-5233713-20140530113326/@comment-7418318-20140530114635

If he turns out to be Gray's father, the grave was probably his wife's who also was Gray's mother. I too hope they are not the father-son pair, but that hope is only a small glimmer.