YOU SAID:

I'm going to grandma's today

INTO JAPANESE

私は今日おばあちゃんに行くよ

BACK INTO ENGLISH

I will go to grandma today.

INTO JAPANESE

私は今日おばあちゃんに行きます。

BACK INTO ENGLISH

I am going to grandma today.

INTO JAPANESE

私は今日おばあちゃんに行くつもりです。

BACK INTO ENGLISH

I am going to go to grandma today.

INTO JAPANESE

私は今日おばあちゃんに行くつもりです。

BACK INTO ENGLISH

I am going to go to grandma today.