Have you ever heard this?  'I don't believe in ADHD' or 'ADHD doesn't exist'. I have, more than once.  Two of my three children have ADHD. The thing that doesn’t exist… Apparently, according to some know-it-all experts (who are not experts), it’s because I’m too soft on them and they lack discipline. Bet you’ve heard that one before. It gives you such a warm fuzzy feeling in your stomach, being told your rubbish parenting caused ADHD. No wait, I think that’s just the bile rising up! Twin time! Truly funny is that my daughter with ADHD is a twin.  The other twin,…