Don't tell him anything that he doesn't, or shouldn't, already know from WT literature.
Be the one to ask the questions.
Insist that he answers them.
Don't answer his, he is usually just trying to change the subject.
Give him a guilt trip for every trick he tries to use to change the subject or weasel his way out of confronting the question.
Give him a guilt trip for any tactic he ties to use to bully you into excepting no answer, or a nonsense answer.
... and let your kid hear it all ...