My son Hanook 17yrs old cannot hear from both ears cince 4years be'coz of high fever, he can hear again?

my name is Nabila aziz, Pakistani living in Bahrain. i have 2 sons, Sagar 18 yrs, Hanook 17 yrs old. hanook cannot hearing from both ears, cince 4yrs now. be'coz of high fever. i want to ask u he can hear again & when ? 1 thing more i'm christian.