Yes they did, they wrote a thank you note, they did the correct thing. There the Bible stayed, in the closet. Ultimately the grandfather died and this man grew old himself and was now ill, and decided that maybe there really was something there that was interesting. As he went through book by book and chapter by chapter, he noticed some thing interesting about this Bible. So he began to calculate what the interest would have been on that if invested during all those years that he never opened the Bible.
Faith is like that.
Faith starts small. It may start because of an act of love, or of kindness. Or maybe an act of witness. Or because you knew out of your own need that you should read something and you found it persuasive. Faith sometimes takes that proverbial leap, but more often it consist of small turns.