Well... they look very similar, so, I guess they would fit for the tag at least. Purpose of the tag is so that people searching for that sort of thing will find it.
So lets see... They look almost identical, their names have the same style and you think they aren't brother and sister? I get the feeling they are, but everyone is entitled to their own opinion. And I'm entitled to my opinion to think that your opinion is wrong and stupid. No offense.