YOU SAID:

My mother looks like my mothers mother whos mother wasnt the mother of my mothers mother

INTO JAPANESE

私の母は私の母の母のように見えます母は私の母の母ではありませんでした

BACK INTO ENGLISH

My mother looks like my mother's mother my mother was not my mother's mother

INTO JAPANESE

私の母は私の母の母のように見えます私の母は私の母の母ではありませんでした

BACK INTO ENGLISH

My mother looks like my mother's mother my mother was not my mother's mother