Hello, my mother also has lumbar disc herniation, similar to your father's, and her legs are numb, but my mother has improved after long-term exercise and received some treatment, and now she has recovered almost. So I personally suggest that if you are afraid that your father's illness will get worse because of this job, and he feels the same way, then you can not take this job, and the reasons for refusing are easy to find. Explain the situation directly to the headmaster, saying that your father is in poor health and that health is the capital of the revolution. Working in front of the computer for a long time is really not conducive to his improvement, and it is likely to get worse. I hope the headmaster can understand. However, if your father is a very responsible person and wants to take up this position, and the school especially needs talents like him, then I suggest you try to take up this position first. After all, if you refuse this position for your father without authorization, it may make him even more unhappy. For this disease, we must always urge our father to do exercise, actively accept treatment, and use his spare time to do rehabilitation. This is my personal suggestion, welcome to communicate, thank you!