YOU SAID:

I am my sibling's mother, child, aunt, cousin and niece.

INTO JAPANESE

私は兄弟の母、子供、叔母、いとこ、姪です。

BACK INTO ENGLISH

I am my brother's mother, child, aunt, cousin and niece.

INTO JAPANESE

私は兄の母、子供、叔母、いとこ、姪です。

BACK INTO ENGLISH

I am my brother's mother, children, aunt, cousin and niece.

INTO JAPANESE

私は兄の母、子供、叔母、いとこ、姪です。

BACK INTO ENGLISH

I am my brother's mother, children, aunt, cousin and niece.