Edward Cullen's little siblings

What if Edward Cullen had a little twin siblings what would've happened to them when Edward died
Will they live a human life or a vampire life?
Will they ever live a happy life?
ALL TWILIGHT CHARACTERS BELONG TO STEPHENIE MEYER !!!!!

Rankings:
#121-littlesister
#27- littlebrother
#430- edwardcullen
#111- littlesister
#23-littlebrother
#382- edwardcullen