YOU SAID:

I gave three apples to my cousin's best friend.

INTO JAPANESE

私はいとこの親友にリンゴを3個あげました。

BACK INTO ENGLISH

I gave my cousin's best friend three apples.

INTO JAPANESE

私はいとこの親友にリンゴを3個与えました。

BACK INTO ENGLISH

I gave my cousin's best friend three apples.