YOU SAID:

I got a cat for my cousin-in-law, who is my third cousin twice removed through marriage

INTO JAPANESE

私は結婚を通じて2回取り除かれた私の3番目のいとこである私のいとこのために猫を得た

BACK INTO ENGLISH

I got a cat for my cousin who is my third cousin who was removed twice through marriage

INTO JAPANESE

私は結婚を通じて2回取り除かれた私の3番目のいとこである私のいとこのために猫を得た

BACK INTO ENGLISH

I got a cat for my cousin who is my third cousin who was removed twice through marriage