User blog comment:EvanDude345rv5/Fairy Tail 353 : Nine Ghost Gate/@comment-4829046-20130929025856/@comment-4829046-20130929060339

Yes but my point here is that Ul was not related to Gray. Here from wiki

"Gray was from a village up in the North, but the entire village was destroyed by the demon Deliora. Gray's parents were killed in the incident as well. Lyon, along with Ur, a powerful ice Mage who Jellal claimed could have been one of the Ten Wizard Saints, came investigating Deliora's destruction, and found Gray alive among the ruins.[18] Ur took Gray in as her second student and taught him and Lyon Ice-Make Magic."

Either Silver is Gray's father who has come to Gray's old village to pay his respects to his wife(and possibly even his son) or Silver is Ul's husband who came to Ul's grave. We are yet to know.