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

友達の家で楽しんでいたら、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

I was having fun at my friend's house, and his cousins and other kids from the same grade came too, and we had so much fun!

INTO JAPANESE

友達の家で遊んでいたら、彼のいとこ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

When I was playing at my friend's house, his cousins and other kids from the same grade came over too, and we had a lot of fun!

INTO JAPANESE

友達の家で遊んでいたら、彼のいとこたちや同じ学年の子たちも遊びに来て、とても楽しかったです！

BACK INTO ENGLISH

When I was playing at my friend's house, his cousins and other kids from my grade also came over and it was so much fun!

INTO JAPANESE

友達の家で遊んでいたら、彼のいとこや同学年の子たちも遊びに来て、とても楽しかったです！

BACK INTO ENGLISH

When I was playing at my friend's house, his cousins and other kids in my grade also came over and it was so much fun!

INTO JAPANESE

友達の家で遊んでいたら、彼のいとこや同学年の子たちも遊びに来て、とても楽しかったです！

BACK INTO ENGLISH

When I was playing at my friend's house, his cousins and other kids in my grade also came over and it was so much fun!