hermanito
little brother
hermano
brother
+
-ito
diminutive suffix
Hermanito means little brother and can be broken down into hermano0 (brother0) + -ito1 (diminutive suffix1), literally meaning 'little brother'.
noun
- little brotherA little brother or younger brother.Mi hermanito acaba de cumplir cinco años. // My little brother just turned five years old.