YOU SAID:

my sister’s tooth came into contact with my brother’s tongue

INTO JAPANESE

私の姉の歯が私の兄の舌と接触した

BACK INTO ENGLISH

My sister's teeth came in contact with my brother's tongue

INTO JAPANESE

私の姉の歯が私の兄の舌と接触した

BACK INTO ENGLISH

My sister's teeth came in contact with my brother's tongue