YOU SAID:
I am a person with three other people in my family.
INTO JAPANESE
私は私の家族の他の 3 人の人です。
BACK INTO ENGLISH
I am the other 3 people in my family.
INTO JAPANESE
私は私の家族の他の 3 人です。
BACK INTO ENGLISH
I am the other 3 people in my family.
That didn't even make that much sense in English.