YOU SAID:
My mother sister is also my wife daughter of our eldest son brother
INTO JAPANESE
私の母の妹がまた私たちの長男の弟の妻娘です。
BACK INTO ENGLISH
It is also our eldest brother's wife daughter sister of my mother.
INTO JAPANESE
また、私の母の兄の妻娘姉妹です。
BACK INTO ENGLISH
It is also my mother's brother's wife and daughter sisters.
INTO JAPANESE
また、私の母の兄の妻と娘姉妹です。
BACK INTO ENGLISH
It is also my mother's brother's wife and daughters and sisters.
INTO JAPANESE
また、私の母の兄の妻と娘と姉妹です。
BACK INTO ENGLISH
It is also my mother's brother's wife and daughter and sister.
INTO JAPANESE
また、私の母の兄弟の妻と娘と妹です。
BACK INTO ENGLISH
It is also my mother's brother's wife and daughter and sister.
That didn't even make that much sense in English.