Thus the bees were also in that tree.
Your answer is very correct
The boys were made of the older ones and the younger ones.
Most of the boys were half-relieved, because rationally, they knew a beast really doesn't exist. However, they are stuck on a strange and unknown island, and the younger kids believed that it existed because Jack told them. Jack ruled by fear, and by telling them about a "beast" to keep them in fear.