YOU SAID:

My mother's brother speaks a language which only a monkey can understand

INTO JAPANESE

母の兄は猿だけが理解できる言語を話します

BACK INTO ENGLISH

My mother's brother speaks a language that only monkeys can understand

INTO JAPANESE

母の兄はサルだけが理解できる言語を話します

BACK INTO ENGLISH

My mother speaks a language that only monkeys can understand

INTO JAPANESE

母はサルだけが理解できる言語を話します

BACK INTO ENGLISH

Mother speaks a language that only monkeys can understand

INTO JAPANESE

母はサルだけが理解できる言語を話す

BACK INTO ENGLISH

Mother speaks a language that only monkeys can understand