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double means 2 chickens in the same egg but my sister said she is not sure if it is a double any more we will tell you when they hatch if it is a double or not and post pics if it is
A double yolk egg can and occasionally will hatch two chicks, if both yolks have been fertilized, which they usually are. It produces fraternal (not identical) twins. The danger is that the second chick will not have an air sack to pip into and can suffocate. There is a video on you tube where a lady incubates a few double yolkers, one egg hatches two healthy chicks with her help, and only one chick survives from the other two eggs. Here's the link.