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Just make sure with ANY turtle/tortoise species you go with that you get the proper lighting for it. Without the proper UVB lighting you are setting yourself up for failure.
And be prepared for a long, LONG lifespan. A true tortoise should outlive you depending the species. A Sulcatta Tortoise will get huge, stick to the smaller sizes like a Redfoot or Leopard. I've always wanted a Leopard Tortoise.
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Redfoots and especially Leopards get pretty big, not Sulcata destroyer of suburban backyards big, but too big for the average household. My largest Leopard, when I had her, was just over 16 inches. I brought her inside for the few cold months here and it was not an enjoyable experience for her or I. Most folks should probably go with a captive bred Russian or Hermann's tortoise. They're relatively affordable, cold hardy and reach manageable sizes.
Here's a pic of one of my baby Leopards. And yes she pooped on the food tray while I was feeding her.
OP, Turtles and Tortoises are big commitments. If you're son is looking to get into reptiles, I'd steer him towards snakes, such as a ball python, kingsnake or cornsnake. They are much easier to maintain than a turtle or tortoise.