Gorgeous pictures! It sounds to me as though they may have ear mites. Take a Q-Tip (I prefer the real ones with the non-plastic core) and swab it into the ear canal (not far) and see if black crumbly gunk comes out. Ear mites look similar to coffee grounds. A pain to treat, but the sooner the better. Cats can get hematomas if they hit a blood vessel in the ear with the kicking. As far as the sneezing they're doing, as long as it's not yellowish/greenish it's not bacterial. If it is, they should both be put on antibiotics to knock out infection. Hope it's neither one!