A child should NEVER EVER EVER be forced to sit on the potty! Ever! The parents are turning this into a power struggle! Read pretty much any article on potty training, any kind of negativity can destroy your efforts to potty train. ALWAYS ALWAYS ALWAYS be positive, if the child has an accident it's " oh well, we' ll try again next time" and if child doesn't want to sit on the potty, he doesn't want to sit on the potty. Let it go. You have to find other ways of encouraging him without putting any pressure. I know it's tricky but I have found that any kind of negativity or pressure will cause a regression. I know because I made every mistake in the book when I potty trained my son and have since done lots of researchgood luck.