YOU SAID:

a friend of mine said that he might go to my sibling's party, but i don't want him to come because i don't appreciate him that much.

INTO JAPANESE

私の友人は、彼が私の兄弟のパーティーに行くかもしれないと言ったが、私は彼にそれほど感謝していないので、私は彼に来てほしくない。

BACK INTO ENGLISH

My friend said he might go to my brother's party, but I don't want him to come because I'm not so grateful to him.

INTO JAPANESE

私の友人は彼が私の兄のパーティーに行くかもしれないと言ったが、私は彼にそれほど感謝していないので、私は彼に来てほしくない。

BACK INTO ENGLISH

My friend said he might go to my brother's party, but I don't want him to come because I'm not so grateful to him.