I worked in Thailand for about 9 months. I was totally legal on a non-B and work permit. However, it wasn't until I was there almost 6 months before I realised my school didn't add my son to my non-B as a dependent. When I asked them they said it's not illegal because he's under 18yo. Then when we left Thailand, he got the stamp at the bottom of the picture in his passport. Would it stop us returning to Thailand?