YOU SAID:

My nephew's grandmother had 3 sons and nephew as her grandson and she is my mother

INTO JAPANESE

3 人の息子と甥の孫として、私の甥の祖母が持っていた、彼女は私の母

BACK INTO ENGLISH

As his three sons and his nephew's grandson, the nephew of my grandmother, she is my mother.

INTO JAPANESE

3 人の息子および彼の甥の孫、私の祖母の甥として彼女は私の母です。

BACK INTO ENGLISH

As his three sons and his nephew's grandson, my grandmother's nephew she is my mother.

INTO JAPANESE

3 人の息子と彼の甥の孫、彼女は私の母は私の祖母の甥。

BACK INTO ENGLISH

My mother is my grandmother's nephew, her three sons and his nephew grandson.

INTO JAPANESE

私の母は私の祖母の甥、彼女の 3 人の息子および彼の甥の孫です。

BACK INTO ENGLISH

My mother is the nephew of my grandmother's nephew, her three sons and his grandson.

INTO JAPANESE

私の母は、私の祖母の甥、彼女の 3 人の息子および彼の孫の甥です。

BACK INTO ENGLISH

My mother is my grandmother's nephew and the nephew of her three sons and his grandson.

INTO JAPANESE

私の母は私の祖母の甥と彼女の 3 人の息子と彼の孫の甥です。

BACK INTO ENGLISH

My mother is my grandmother's nephew and the nephew of her three sons and his grandson.