YOU SAID:

My dad sang let it go to my sister for her sweet sixteen.

INTO JAPANESE

私の父は彼女の甘い16歳のためにそれを私の妹に行かせました。

BACK INTO ENGLISH

My dad sent it to my sister for her sweet sixteen-year-old.

INTO JAPANESE

私の父は彼女の甘い16歳のために私の妹にそれを送った。

BACK INTO ENGLISH

My dad sent it to my sister for her sweet sixteen-year-old.