S.C.
No idea if this could be an issue, but check out www.gaps.me. If there are food issues, constipation or other gastrointestinal issues and bedwetting, there might be an issue with his digestive tract. Do a YouTube search for Dr. Natasha Campbell-McBride and GAPS or Weston Price conference / Wise Traditions. There are snippets of her presentations that talk about all these things... the problem is finding the presentations since there were many the last time I looked. 15 will be a tough age to do the GAPs program, but if you can get him on board for a few months, you should see improvements if that is the reason behind the bedwetting.