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The 65kg load rating is probably per tire, so your bike's max load (based on the tires) would be around130kg. That being said, that's just the tires and not all the other components. You would also be putting more weight on the rear wheel than the front.
I'd look your bike up on the manufacturer's website to find the max load rating.
Contact the manufacturer. I have a Worksman front loader (sort of a 2 in front one in the rear a.k.a. tadpole configuration three wheeler) that has 2 X 20" front wheels, and it's rated for 225Kg. The wheels are built to a higher specification because of use. Folding bikes are usually built to be relatively light weight. Probably each tire on your foldy had a 65Kg limit, so 130Kg for both. Use correct tire pressure, of course. How much is the total load, i.e. you + kid + gear (backpacks full of fun, etc) = load. Blow a tire is not too common, but can happen. And relatively easy to replace. Fold a wheel and you'll need to re-build it, or replace it.