Grandma and her three nephews

One grandma had three nephews and she wanted to test their faithfulness for her. She takes the oldest of the boys to one well then she gets ready to jump in it. The boy grabs her immediately.
The next day he finds in his yard a nice Jeep with a note on it:" You make good, you find good. Signs Grandma."
The second day takes her second nephew and she does the same thing: she gets ready to jump in the well then he grabs her immediately.
The next day he also finds in his yard a nice Jeep with the same note:" You make good, you find good. Signs Grandma.
The third day she takes her smallest nephew and again the same thing: take him to the well, she gets ready to jump in it and then he let's her fall and dies, he went home.
The next day he also finds in his yard a nice Jeep plus a nice yacht behind it with a note on it:" You make good, you find good. Signs Grandpa."