User blog comment:FairyRaven/Fairy Tail Chapter 353: Exorcism, Review and Commentary/@comment-178.148.174.152-20130927130923/@comment-7418318-20130927131404

Let's spin it further and say that Ultear and Gray are half-siblings with the same father and different mothers and they (and Ur) just didn't know it!

No I don't really mean that one...