Yes, kids stay free. There is no extra charge for children, but there will be a charge for meals per person.
When we stayed there in late Oct-2018, we booked by the person. Minimal charge if any for our kids, though you may get caught on the breakfast. We went through a 3rd party site that said breakfast was included. When we arrived it wasn't listed on the reservation. We sorted ut out, otherwise it would have been $9/kid per day for the breakfast.
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