Talk:Riliane Lucifen d'Autriche/@comment-69.115.21.210-20131004014129/@comment-12515537-20140410220742

Actually, they could be half identical. If the original emberyo split before it had been fertilized, with each equal part being fertilized seperately (Polar body twins). This would mean that Riliane and Allen would share 75% of their DNA, less than identical twins but more than fraternal, most likely resulting in them looking similar enough that unless you personally knew both of them, them could be mistaken as each other.

http://multiples.about.com/cs/glossary/g/polarbody_def.htm

http://en.wikipedia.org/wiki/Twin#Semi-identical_twins

( I realize this comment is six months old; however, I felt compelled to comment)