Does くれる always refer to something happening to "me," or can it sometimes refer to other people receiving something, given they're the implied subject?

I was taught the difference between ～てもらう and ～てくれる, but I swear I've seen sentences where the くれる refers to other people. But maybe I'm crazy.

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Does くれる always refer to something happening to "me," or can it sometimes refer to other people receiving something, given they're the implied subject?

Answer:==>
It can refer to other people in very special cases.
The person must be the person very close to you.

Example sentences;
(You are talking to your wife.)

山田さんがJohnにおもちゃを買ってくれるそうだよ。
I hear that, Mr.Yamada will buy a toy to John.

山田さんがJohnにおもちゃを買ってくれたそうだよ。
I hear that, Mr.Yamada has bought a toy to John.
Mr.Yamada seems to bought a toy to John.
( Would you correct my Englilsh, if it's unnatural?)

In this case, John must be very close to you. So, for example,
he must be your son.
You can't use this expression, if John is completely other person.

To summarize this, usage of くれる、　 in the case below.
Other person to do something to you, or to a person in your group ( which is very close to you)