When applying for a non-immigration (teaching) visa, I have been told that the No Objection Certificate to travel that I get from my current overseas school needs to include working position and salary at my new school in Thailand. Can anyone please confirm this?

I am traveling to thailand in October end. I will land at bangkok (Savaranbhumi airport ) I will take tourist Visa On Arrival.

My question is

My nephew is traveling with me. He is 13 years old. As he is minor. Do I need to carry any NOC from his school and Parents?

Actually when I traveled Singapore this year. Thomas cook guided me to carry both. If u have any experience in thailand. Pls advise.