User blog comment:FairyRaven/Fairy Tail Chapter 392: You Must Not Forget, Review and Commentary/@comment-25009609-20140711142815/@comment-7418318-20140711143854

Gray is the last surviving part of this family that Silver might want to avenge. And from the flashback where Silver told Gray to become strong I'd say a strong and most importantly surviving Gray is part of Silver's dream for the future.