My mother, 4 1 year-old, was forcibly violated by the tenant at work. What if the other family says she has mental problems?

Since your mother has been violated, you should go through legal procedures. First, your mother is an employee of the hotel, and the hotel should help your mother. Second: whether there is a mental problem, we should not only listen to each other's side of the story, but also identify it. Even if the other party has mental problems, then as a guardian of one party, it is also responsible for poor supervision and should be compensated. You'd better consult a lawyer. After all, I am a professional and can help you.