YOU SAID:

my mothers mother helps my mothers mother on law

INTO JAPANESE

私の母親の母をにより法律で私の母親の母

BACK INTO ENGLISH

My mother's mother, the mother of my mother in law

INTO JAPANESE

母の母、義理の母の母

BACK INTO ENGLISH

My mother's mother, mother-in-law's mother

INTO JAPANESE

私の母の母、母の義理の母