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Most such break-ins are smash-and-runs, so by forcing the robber to have to look through your vehicle for valuables, you're encouraging him to instead move on to another one.
Take your wallet and some emergency money with you on the hike. Your vehicle is more likely to be broken into than you are to be mugged on the trail.
You want to carry a credit card or some extra money with you in case of an emergency. If one of the kids breaks a leg and ends up in a local hospital, you'll need money at least to buy dinner for your other children.
Read more about day hiking with children in my guidebook Hikes with Tykes.
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