YOU SAID:
Jonathan went to see his first cousin`s birthday party.
INTO JAPANESE
ジョナサンは最初のいとこの誕生日パーティーを見に行った。
BACK INTO ENGLISH
Jonathan went to see his first cousin's birthday party.
INTO JAPANESE
ジョナサンは最初のいとこの誕生日パーティーを見に行った。
BACK INTO ENGLISH
Jonathan went to see his first cousin's birthday party.
That didn't even make that much sense in English.