The all day adventure pass for kids is 20.99 but if you get the Houston City Pass which gives you access to the aquarium as an option along with 4 other attractions in Houston, the aquarium access will come down to 11.90 for kids but likely to be without the adventure rides. You might want to check out the City Pass site https://www.citypass.com/houston as well as the aquarium site for details https://tickets-houston.aquariumrestaurants.com/houstonaquarium/all-daypass.html
Children 2 and under are free. Children under 42" are $10.99
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