Thread:UltimateYJfan98/@comment-1038387-20120625204548/@comment-1038387-20120625205219

The comment was: "We don't know if Batman adopted Tim Drake or not on Earth-16. In the comics, Tim was initially in custody of his dad when he b" [cut off because the comment section has a character limit]

Tim became Robin in 1989. He lived with his father until Jack Drake's death in 2004. He wasn't adopted until 2006. So "adopted son" is all but certain.