You might also look at something like a Garmin Rino. It might work. It's a walkie-talkie, but it can transmit the GPS coordinates over 5 miles, according to the specs. You can find them used pretty cheap.
You would at least be free of having to pay a subscription or anything ,but more info is needed, like the proximity of the parents to the child.
Are they worried about him wandering away from them or their house, or they want to be able to track him if he wanders away from school while they're at home?
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