Two words that make me cringe. Two words that will be the death of me. My daughter was a piece of cake. At 18 months, she started potty training herself so there was barely any effort on my part. At that time, I didn’t understand the struggles other moms would talk about, I didn’t get what was so difficult about it. Enter my son. At three and a half years old, he has successfully resisted every tactic I’ve tried and I just want to give up. Tactic #1 We started with a reward system. Bought him a new dinosaur that he could open if he went on the potty “like…