Apparantly the rationale behind the study is for this sister to go through the Young People Ask book with her.
That book covers mostly issues that parents should be discussing with their children, not a outside 3rd party. What I see is that your wife and the JWs don't feel you, the parents, can be trusted to indoctrinate your children with the proper WTS beliefs.
As a person who grew up in a family with a non-JW father and a JW mother, I can say that this is designed to limit the parents authority with child, (or at least one parent's authority).
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yp p. 320 Practical Answers to the Questions You’ve Been Asking! ***Questions
Young People Ask—Answers That Work is unlike other books produced for youths. It is the product of discussions with hundreds of youths all over the world. And its answers, based on God’s Word, the Bible, really work! Here are just some of the questions this book answers:· Why Don’t My Parents Understand Me?
· Why Did Dad and Mom Split Up?
· How Can I Make Real Friends?
· Why Do I Get So Depressed?
· Why Won’t the Kids Leave Me Alone?
· What About Sex Before Marriage?