Well, as I said before, it's more of an advice book than one they would use to indoctrinate anyone, but she could have placed it with him to try and get him interested in the jws, with a view to giving him some more indoctrinating stuff later. I think you are right to nip it in the bud now, just in case that's in her mind. Remember, whatever they say, jws put the org before anything else, including family, it's what they are constantly told to do.
Linda