Jen, have you provided your colonies with plenty of space to store nectar, laying eggs at the same time, all the bees rest inside the hive without having to beard outside. how many queen cells did you allowed to mature, and are you certain you seen them all. swarm prevention and you will never entirely eliminated, but you can certainly limited, that has not happened here. storage space for incoming nectar, brood rearing space. right now your parents colony is in the process of destroying itself. issuing one after swarm after another. cutting of the total colony strength down to almost nonsurvival levels. examine your brood chambers, actually still there after all these swarms.
other to expect honey I did any of these colonies would be somewhat miraculous. I would stock up on sugar now so it's available when you need it. I have said all of them that beekeeping is not very complicated, you have a number of criteria that must be met to discourage swarming, seriously need to review that. goodness sakes examine those brood chambers for more queen cells
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