Well no sooner than you said your bees swrmed and I made a comment. I caught 2 in my yard! One was crazy huge too!
Yeah, evidently it's that time around here.
It doesn't make a difference that they're nearby. In fact, you could hive them at the old location and move the swarmed hive to a new location. Richard Taylor would do that for making comb honey. Hive them on a medium of drawn comb, add an excluder and comb honey supers above.
open brood bees removed