YOU SAID:
The party is back brothers, and the fun will never end!
INTO JAPANESE
パーティーは帰ってきた兄弟たちであり、楽しみは終わりません!
BACK INTO ENGLISH
The party is the brothers who came back and the fun never ends!
INTO JAPANESE
パーティーは帰ってきた兄弟たちで、楽しみは終わりません!
BACK INTO ENGLISH
The party is the brothers who came back and the fun is not over!
INTO JAPANESE
パーティーは帰ってきた兄弟たちで、楽しみは終わっていません!
BACK INTO ENGLISH
The party was the brothers who came back and the fun was not over!
INTO JAPANESE
パーティーは帰ってきた兄弟たちで、楽しみは終わっていませんでした!
BACK INTO ENGLISH
The party was the brothers who came back and the fun was not over!
That didn't even make that much sense in English.