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People have tried to hatch twins from double yolkers, and it HAS happened. But it is pretty rare that both chicks livelong enough to pip or make it past pipping. and it's even more rare when both chicks hatch out all the way but don't make it. It has happened, when both chicks hatch out and live with not many problems at all. But usually when people attempt this, no matter how much care you give it, usually both form until they start to crowd inside the egg, then sometimes one dies(usually the small one) because it's too small and the other one is big and it crushes it. Then, if your lucky, the big chick may pip and zip, and MAYBE will get passed that, but then it will die because of too much of something(like calcium or something like that but I can't remember) and the chick that survives last will usually be very big from feeding off the smaller, weaker one.
So, yes it is possible and many have tried it. but it's a hard process and usually disappointing in the end.
But it's possible!!!