Board Thread:General Discussion/@comment-6192846-20130913170916/@comment-69.115.21.210-20131204120030

That's not very likely. It's possible but not likely, especially seeing as they're half brothers. It is possible that they both took after their father and therefore look very similar but seeing as they have two different mothers it's more likely they had very defining differences (aside from the obvious) not to mention the age difference.