When Alex first started walking and climbing, we removed the bottom two rungs from the tree house ladder. This prevented any unassisted climbing. We decided this year Alex was old enough to go up the ladder by himself (as long as an adult was in the backyard) and replaced the two rungs. Then we caught him carrying things (like a full bucket of water) up the ladder so that he was only using one hand to climb. It’s a pretty steep ladder so we told Alex he had to use both hands. To solve the problem of getting things into the tree house (without always having to ask Mom and Dad), Wade installed a pulley system.