>>2067917Your dad is shitty at hive management then. If he’s checking them infrequently then he cannot establish a pattern of swarm behavior and won’t be able to prevent a swarm from happening.
Are the workers making a cell on the bottom or edge of the frames like in the picture? They do that sometimes but if they’re definitely preparing to swarm you’ll see a queen larva inside the cup or it will be capped off and have a pupating queen inside it, which will then be about 9 days until they emerge. After that you have a couple choices. You can squish the larva, or if you fancy yourself someone who wants to try husbandry you can remove that frame and try to put it into a nucleus hive, and if you’re successful you’ll have doubled your bees and have a second colony.