YOU SAID:

my parents say that i can't make out with my brother's girlfriend's sister's cousin and i don't understand why

INTO JAPANESE

両親は兄の彼女の妹のいとことは分からないと言っていて理由がわからない

BACK INTO ENGLISH

My parents say I don't know my brother's sister's cousin and I don't know why

INTO JAPANESE

両親は兄の妹のいとこがわからないと言っていて、その理由もわからない

BACK INTO ENGLISH

My parents say I don't know my brother's sister's cousin, and I don't know why

INTO JAPANESE

両親は兄の妹のいとこがわからないと言っていて、その理由もわからない

BACK INTO ENGLISH

My parents say I don't know my brother's sister's cousin, and I don't know why