Re: I checked a couple hives-Small clusters, no brood
I am in agreement with the others about those clusters being pretty small. You should have a frame of emerging brood in one or more of your other hives. Give them each one frame a see what happens. Two of my seven overwintered nucs do not have brood either. I do not hold out much hope for them. There is not much benefit in saving a poor queen other than for the experience.
Thankfully, the bees are smarter than I am. They are doing well, in spite of my efforts to help them.