The first reason is that the design of the jstars courtyard is relatively strong. Let's visit now, and we can see that the whole Qiao family is particularly like a castle. The periphery of the yard is a wall as high as ten meters. As long as the door is closed, bandits can't get in, and they can store food in the yard. Even if they can't get out behind closed doors, they can maintain their livelihood for a long time without worrying about bandits.
The second reason is that the jstars have their own guards. Although he is guarding his home, he is at least better than bandits because of his money and well-equipped weapons. Moreover, the salary given by the jstars is relatively high. People who work in Qiao's family can't earn more money than those in other places. Even if bandits want to sneak into the jstars to buy people to be internal employees, it is impossible.
Generally speaking, no matter from which aspect, the reason why the jstars were not harassed by bandits was because the bandits could not start, attack from the outside and break through from the inside. In the end, they can only do nothing about jstars. The Qiao family has never been robbed by bandits for so many years.