YOU SAID:
Hey sister just went to the bar for a martini
INTO JAPANESE
ちょっと姉はマティーニのためにバーに行きました
BACK INTO ENGLISH
A little older sister went to a bar for Martini
INTO JAPANESE
姉がマティーニのバーに行きました
BACK INTO ENGLISH
My sister went to a bar in Martini
INTO JAPANESE
私の妹はマティーニのバーに行きました
BACK INTO ENGLISH
My sister went to a bar in Martini
That didn't even make that much sense in English.