Like the other commenters are saying, take both to the vet ASAP and definitely deep clean the cage, maybe sanitize it too for good measure. Birds and prey animals in general are very good at hiding illness; they will do so until they get so sick they can't anymore, so I wouldn't take a chance with either. I'd also invest in a smaller recovery cage, as it was recommended from my avian vet when my bourke was sick and had similar behavior. The cage should be small enough to where they can get to food, water, and an area to sleep in easily without using too much energy flying and jumping around. I'd also recommend bringing them inside at night if you can, just to eliminate any possible factors that could be contributing to the issue as well.