I’m sorry to hear that, I pray your family made it through that tragedy!
American foul brood is no joke, destroying the hive and all the equipment is only remedy I know of.
We had a complete lose of hives last year. Mainly do to laziness on our part, mites took over and they didn’t make the winter.
We’re going to try the Alaskan method on one of hives this year to make up for it. Just one brood box for the hive, instead of three (we’re in the upper Midwest, long winters) and stack supers to get some honey this year. Pretty much all but seals that hives fate, but hopefully we can successfully winter the other one and split it next spring.