B.W.
What worked with my girls was giving them a choice when they wanted to go, or if you have 2 bathrooms, which one they wanted to use. But I made it so they had to make the choice to at least try. Something like, "do you want to use the upstairs or downstairs bathroom?" or "do you want to try before or after mommy goes?" Seemed like giving them a choice, made them feel a little more independent. I also tried to catch them each morning, so 1st thing they did in the morning was go into the bathroom. Good luck!