I would make up an unusually large number, but not impossible, "I've got 9, why do you ask?"
They are going to call you a liar no matter what you say, so you may as well give them a false number from the get-go. Another tactic would be to answer, "This year I have 37, can you believe the size of classes these days?" That should get him off the subject of your family, and he'll start wondering about your straight job instead. Then you should act like you said something you shouldn't and dismiss the whole idea by asking for the sale.

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