YOU SAID:

I had fun at my friend's house, and his cousins, some kids in the same grade as me, also came over, and we had alot of fun!

INTO JAPANESE

友達の家で遊んだんですが、彼のいとこたちや同じ学年の子たちも来て、とても楽しかったです！

BACK INTO ENGLISH

We played at my friend's house, and his cousins and other kids from the same grade came too, and it was so much fun!

INTO JAPANESE

友達の家で遊んだのですが、彼のいとこや同じ学年の子たちも来てくれて、とても楽しかったです！

BACK INTO ENGLISH

I played at my friend's house, and his cousins and kids from the same grade also came, and it was so much fun!

INTO JAPANESE

友達の家で遊んだんですが、そのいとこや同じ学年の子たちも来てくれて、とても楽しかったです！

BACK INTO ENGLISH

I played at my friend's house, and her cousins and kids from the same grade also came, and it was so much fun!

INTO JAPANESE

友達の家で遊んだのですが、そのいとこや同じ学年の子たちも来てくれて、とても楽しかったです！

BACK INTO ENGLISH

I played at my friend's house, and her cousins and kids from the same grade also came, and it was so much fun!