Twin of Darkness, Twin of Light ( sounds like a lifetime movie)

It seems that there is no stronger bond that that of twin siblings.  They are conceived together, they spend nine months in the womb together in the same uterus, they are birth together, they look a like, they grow up together, etc.  However, you'd be surprised at the number of twins who actually want to separate their identity from their twin.  The intentionally act nothing like their twin or go out of their way to be totally opposite just so they can be their own person.   When their are powerful entities involved, it only gets more complicated.  Now, I'm sure you all remember the stories of the Nephilim.  There were these fallen angels that came to Earth an began impregnating women.  They spawned an off race of half-human half-angel beings that came in giant form.  They were the Nephilim and they were very powerful.  However, what happened then when these Nephilim, in turn began mating with other human women and making their own offspring? Well I can tell you the angelic powers of