Talk:Raven Branwen/@comment-28171999-20180106183858/@comment-26397825-20180113020135

As the anon said, a set of twins with both a male and female is always a fraternal twin set. Indentical twins are born from the same egg being fertilised twice at the same time and then splitting, and they are always the same gender. Fraternal twins are born from two different eggs being fertilised at once, and so the children are as different to each other as normal siblings with an age gap.

There is always an older and a younger twin; Raven calling Qrow her younger brother basically means she came out first. I've met kids that lord that five minute gap over their twin in real life.