YOU SAID:
My mother, who has blonde hair, went to the store.
INTO JAPANESE
ブロンドの髪をしている私の母は店に行きました。
BACK INTO ENGLISH
My mother with blonde hair went to the store.
INTO JAPANESE
ブロンドの髪をした私の母は店に行きました。
BACK INTO ENGLISH
My mother with blond hair went to the store.
INTO JAPANESE
ブロンドの髪をした私の母は店に行きました。
BACK INTO ENGLISH
My mother with blond hair went to the store.
That didn't even make that much sense in English.