It is possible. Obviously you have to have 2 eggs for fraternal twins. I read a study a couple years back that indicated it was possible. Plain logic says it's possible too. But I think part of the theory is that 2 eggs are released from 1 overy at the same time. But I seriously question that being always the case.
That was actually one of my hopes and fears when I was TTC - Twins - they run in my family as well.
