Although mites are usually black i would not rule that out, especiall because both have it. A kitten indoors should have sparkly clean ears, so i would have it looked at, could be an infection, or yeast, does it smell funky? You can usually tell with ears by the smell. . It is safe to gently wipe the outer ear with something soft like gauze, but dont use qtips or go in the ear, you will just shove it down more. Are they itchy?
I prefer my people to wear fur..
Gonzaga's Lady Perdita "Lady" CKC Yellow Lab
Adoptee Gucci super fuzzbutt
Adoptee Prada crazy dog extrodinaire
Tickles Tortie cat the owns my daughter