YOU SAID:

I want to ride my brother's sister's cousin in law's bike.

INTO JAPANESE

兄の妹の義理のいとこの自転車に乗りたいです。

BACK INTO ENGLISH

I want to ride my brother's sister's cousin's bike.

INTO JAPANESE

兄の妹のいとこの自転車に乗りたいです。

BACK INTO ENGLISH

I want to ride my brother's sister's cousin's bike.