Normally when 2 or more males are bred to a female it's usually to increase the chances of fertility not in hopes to get babies from each sire so it's not something that happens often enough for people to plan on it or expect it. Retained sperm happens but not often. Best answer I could give: it happens but it's a gamble.
http://ball-pythons.net/forums/showt...ire-one-clutch
http://www.edmontonreptiles.com/foru...ked-for-better
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