Thanks TimDrake! I asked another elder about his illegal status. He told me that if he had petitioned immigration to fix it, he is ok to serve. He told me that elders have a letter from the WT saying that if he is trying to fix his situation, he can serve.
Now as for the daughter, I asked myself: "what kind of communication existed between father and daughter?". Like I mentioned it before, for almost a year she was having porneia with the guy and other guys. Her friends knew about it. Her parents didn't know it. Is that an example for the congregation? Can he give advice to families on how to raise teenagers?