YOU SAID:

next year my uncle will give my cousin who was born ten years ago a phone

INTO JAPANESE

来年、私のおじさんは10年前に生まれた私のいとこに電話をします

BACK INTO ENGLISH

Next year, my uncle will call my cousin born ten years ago

INTO JAPANESE

来年、私の叔父は10年前に生まれた私のいとこに電話します

BACK INTO ENGLISH

Next year, my uncle will call my cousin born ten years ago