YOU SAID:
my sister and her boyfriend are idiots
INTO JAPANESE
私の妹と彼女のボーイフレンドはばかです
BACK INTO ENGLISH
My sister and her boyfriend are stupid.
INTO JAPANESE
私の姉と彼女のボーイフレンドはばかだ。
BACK INTO ENGLISH
My older sister and her boyfriend are stupid.
INTO JAPANESE
私の姉と彼女のボーイフレンドはばかだ。
BACK INTO ENGLISH
My older sister and her boyfriend are stupid.
You should move to Japan!