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also, stability is key as there will be unprotected drywall behind it.

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I'll offer another vote for the hanging heavy bag (which are relatively easy to hang), though you may want to shop for one which has a ring at the bottom. With the ring you can fasten a bungee cord to the bottom and attach it to a hook which you fasten in the floor (if possible) or to a heavy object.

The bags swing a lot, especially with kicks, and you'll eventually destroy a piece of drywall. You will need to put up a piece of plywood or something similarly sturdy to protect the drywall.

Also, I don't know much about the strain on a child using these, but it may be worth it for you to buy an adult sized (80 or 100 lbs) bag for your use and a smaller (25-40 lbs.) bag for your five year old. Kicking a big heavy bag may not be a problem for a five year old, but hitting one could be an unnecessary strain.

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Agreed on how much hanging bags swing, even heavy ones. They'll go horizontal or close to it. A tie on the bottom sounds great.