Hi J.,
If you're skeptical regarding the ear tubes your pediatrician has suggested, you should be twice as skeptical about a chiropractor treating your son for an ear infection. I sometimes go to a chiropractor for muscular problems but some chiropractors tend to stretch the truth when they say they can treat infections.
Warning bells should be going off when they tell you that your son will need MANY additional treatments.
Yes, there are tiny bones in the ear, but they can NOT be adjusted. Subluxation of the spine is a myth; our spines don't go out of alignment and when people speak of their back being out, it's really muscle strain that causes the pain.
Perhaps your son has allergies to certain foods; look into anything related to milk, cheese, yeast, eggs etc.
An addition: There are no published medical studies that show spinal manipulation is effective against ear infections.
An untreated ear infection can spread to the middle ear, surrounding bone, even into the brain and can become a real medical emergency.
Sorry, but not all chiropractors are honest; stay away from those who promise a cure, suggest "preventive adjustments,"who "prescribe" dietary supplements, homeopathic products, herbal products to treat diseases or who sell these products in their offices. Also be aware that neck manipulation can and has caused serious injuries.
Stick with a medical doctor.