The bouldering is great although I've only been twice in the middle of summer. 30 degree heat made anything harder than sitting in the trees drinking cheap good wine really hard.
The bouldering surrounds the campsite/car parks which makes everything really accessable and I imagine child friendly. Mini topo blocs guides are available in the gift shop at the top of the town. All the locations besides the glacial stream are much cooler but may not be child friendly.
Surprise du chef is the most famous problem in the valley at 7b/7b+, but the best problem I climbed was Fantastique an amazing 6b+ in Cahutes area.
Let me know if you have any other questions.