A noble act on the brother's part. But I have to wonder, what happens when the three years are up and Abby goes right back to her gambling ways?
Isn't that what's great about these sorts of stories, though? Clearly, he knows that what he's doing isn't going to change his sister's nature, but he can't bring himself to sit idly by and do nothing. She's going to fall on her face, and inevitably, she'll take her "brother" with her.