YOU SAID:

I am 13 years old and I have 3 siblings two brothers and 1 sister I have grandmother 70 years old

INTO JAPANESE

私は13歳で、兄弟が2人兄弟が3人、祖母が70歳の姉妹が1人います

BACK INTO ENGLISH

I am 13 years old, have 2 brothers, 3 brothers and 1 grandmother 70 years old sister

INTO JAPANESE

私は13歳で、2人の兄弟、3人の兄弟と1人の祖母70歳の姉妹がいます

BACK INTO ENGLISH

I am 13 years old and have 2 brothers, 3 brothers and 1 grandmother 70 year old sister

INTO JAPANESE

私は13歳で2人の兄弟、3人の兄弟と1人の祖母70歳の姉

BACK INTO ENGLISH

I am 13 years old, 2 brothers, 3 brothers and 1 grandmother 70 year old sister

INTO JAPANESE

私は13歳、2人の兄弟、3人の兄弟と1人の祖母70歳の姉妹です

BACK INTO ENGLISH

I am 13 years old, 2 brothers, 3 brothers and 1 grandmother 70 year old sister