Chronic tearing of both eyes is most commonly "dry eye
" or allergy.
If he wears contact lenses, take them out, see how he does. Try a commercial artificial tear 1 drop each eye 3-4 times a day. Apply a warm compress every morning. Allergy and infections often have itching and redness. If his tear drainage system is blocked, only doc can fix. If the above steps do not help, best to see a doctor.