Apologies for the graphic picture but here's an Araucana double yoker that has just hatched the smaller one on the left hasn't absorbed its yolk but pipped it self out it may or not live the other bigger one is unfortunately dead.
I have never had a double yoker hatch and thought although possible was probably nearly impossible, that said i have thrown the odd double yoker in over the years with no success, i explained this to the BH but said i would throw it in and we would see. It was viable. Not entirely happy with the outcome but interesting all the same - any one else had a double yoker hatch and survive?